![Masami Hiramatsu](/assets/img/avatar_default.png)
Support @BUILDID or @FILE suffix for SDT events. This allows perf to add probes on SDTs/pre-cached events on given FILE or the file which has given BUILDID (also, this complements BUILDID.) For example, both gcc and libstdc++ has same SDTs as below. If you would like to add a probe on sdt_libstdcxx:catch on gcc, you can do as below. ---- # perf list sdt | tail -n 6 sdt_libstdcxx:catch@/usr/bin/gcc(0cc207fc4b27) [SDT event] sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49) sdt_libstdcxx:rethrow@/usr/bin/gcc(0cc207fc4b27) [SDT event] sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49) sdt_libstdcxx:throw@/usr/bin/gcc(0cc207fc4b27) [SDT event] sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49) # perf probe -a %sdt_libstdcxx:catch@0cc Added new event: sdt_libstdcxx:catch (on %catch in /usr/bin/gcc) You can now use it in all perf tools, such as: perf record -e sdt_libstdcxx:catch -aR sleep 1 ---- Committer note: Doing the full sequence of steps to get the results above: With a clean build-id cache: [root@jouet ~]# rm -rf ~/.debug/ [root@jouet ~]# perf list sdt List of pre-defined events (to be used in -e): [root@jouet ~]# No events whatsoever, then, we can add all events in gcc to the build-id cache, doing a --add + --dry-run: [root@jouet ~]# perf probe --dry-run --cache -x /usr/bin/gcc --add %sdt_libstdcxx:\* Added new events: sdt_libstdcxx:throw (on %* in /usr/bin/gcc) sdt_libstdcxx:rethrow (on %* in /usr/bin/gcc) sdt_libstdcxx:catch (on %* in /usr/bin/gcc) You can now use it in all perf tools, such as: perf record -e sdt_libstdcxx:catch -aR sleep 1 [root@jouet ~]# It really didn't add any events, it just cached them: [root@jouet ~]# perf probe -l [root@jouet ~]# We can see that it was cached as: [root@jouet ~]# ls -la ~/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/ total 976 drwxr-xr-x. 2 root root 4096 Jul 13 21:47 . drwxr-xr-x. 3 root root 4096 Jul 13 21:47 .. -rwxr-xr-x. 4 root root 985912 Jun 22 18:52 elf -rw-r--r--. 1 root root 303 Jul 13 21:47 probes [root@jouet ~]# file ~/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/elf /root/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/elf: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2, stripped [root@jouet ~]# cat ~/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/probes %sdt_libstdcxx:throw=throw p:sdt_libstdcxx/throw /usr/bin/gcc:0x71ffd %sdt_libstdcxx:rethrow=rethrow p:sdt_libstdcxx/rethrow /usr/bin/gcc:0x720b8 %sdt_libstdcxx:catch=catch p:sdt_libstdcxx/catch /usr/bin/gcc:0x7307f %sdt_libgcc:unwind=unwind p:sdt_libgcc/unwind /usr/bin/gcc:0x7eec0 #sdt_libstdcxx:*=%* [root@jouet ~]# Ok, now we can use 'perf probe' to refer to those cached entries as: Humm, nope, doing as above we end up with: [root@jouet ~]# perf probe -a %sdt_libstdcxx:catch Semantic error :* is bad for event name -it must follow C symbol-naming rule. Error: Failed to add events. [root@jouet ~]# But it worked at some point, lets try not using --dry-run: Resetting everything: # rm -rf ~/.debug/ # perf probe -d *:* # perf probe -l # perf list sdt List of pre-defined events (to be used in -e): # Ok, now it cached everything, even things we haven't asked it to (sdt_libgcc:unwind): [root@jouet ~]# perf probe -x /usr/bin/gcc --add %sdt_libstdcxx:\* Added new events: sdt_libstdcxx:throw (on %* in /usr/bin/gcc) sdt_libstdcxx:rethrow (on %* in /usr/bin/gcc) sdt_libstdcxx:catch (on %* in /usr/bin/gcc) You can now use it in all perf tools, such as: perf record -e sdt_libstdcxx:catch -aR sleep 1 [root@jouet ~]# perf list sdt List of pre-defined events (to be used in -e): sdt_libgcc:unwind [SDT event] sdt_libstdcxx:catch [SDT event] sdt_libstdcxx:rethrow [SDT event] sdt_libstdcxx:throw [SDT event] [root@jouet ~]# And we have the events in place: [root@jouet ~]# perf probe -l sdt_libstdcxx:catch (on execute_cfa_program+1551@../../../libgcc/unwind-dw2.c in /usr/bin/gcc) sdt_libstdcxx:rethrow (on d_print_subexpr+280@libsupc++/cp-demangle.c in /usr/bin/gcc) sdt_libstdcxx:throw (on d_print_subexpr+93@libsupc++/cp-demangle.c in /usr/bin/gcc) [root@jouet ~]# And trying to use them at least has 'perf trace --event sdt*:*' working. Then, if we try to add the ones in libstdc++: [root@jouet ~]# perf probe -x /usr/lib64/libstdc++.so.6 -a %sdt_libstdcxx:\* Error: event "catch" already exists. Hint: Remove existing event by 'perf probe -d' or force duplicates by 'perf probe -f' or set 'force=yes' in BPF source. Error: Failed to add events. [root@jouet ~]# Doesn't work, dups, but at least this served to, unbeknownst to the user, add the SDT probes in /usr/lib64/libstdc++.so.6! [root@jouet ~]# perf list sdt List of pre-defined events (to be used in -e): sdt_libgcc:unwind [SDT event] sdt_libstdcxx:catch@/usr/bin/gcc(9a0730e2bcc6) [SDT event] sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event] sdt_libstdcxx:rethrow@/usr/bin/gcc(9a0730e2bcc6) [SDT event] sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event] sdt_libstdcxx:throw@/usr/bin/gcc(9a0730e2bcc6) [SDT event] sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event] [root@jouet ~]# Now we should be able to get to the original cset comment, if we remove all SDTs events in place, not from the cache, from the kernel, where it was set up as: [root@jouet ~]# ls -la /sys/kernel/debug/tracing/events/sdt_libstdcxx/ total 0 drwxr-xr-x. 5 root root 0 Jul 13 22:00 . drwxr-xr-x. 80 root root 0 Jul 13 21:56 .. drwxr-xr-x. 2 root root 0 Jul 13 22:00 catch -rw-r--r--. 1 root root 0 Jul 13 22:00 enable -rw-r--r--. 1 root root 0 Jul 13 22:00 filter drwxr-xr-x. 2 root root 0 Jul 13 22:00 rethrow drwxr-xr-x. 2 root root 0 Jul 13 22:00 throw [root@jouet ~]# [root@jouet ~]# head -2 /sys/kernel/debug/tracing/events/sdt_libstdcxx/throw/format name: throw ID: 2059 [root@jouet ~]# Now to remove it: [root@jouet ~]# perf probe -d sdt_libstdc*:* Removed event: sdt_libstdcxx:catch Removed event: sdt_libstdcxx:rethrow Removed event: sdt_libstdcxx:throw [root@jouet ~]# Which caused: [root@jouet ~]# ls -la /sys/kernel/debug/tracing/events/sdt_libstdcxx/ ls: cannot access '/sys/kernel/debug/tracing/events/sdt_libstdcxx/': No such file or directory [root@jouet ~]# Ok, now we can do: [root@jouet ~]# perf list sdt_libstdcxx:catch List of pre-defined events (to be used in -e): sdt_libstdcxx:catch@/usr/bin/gcc(9a0730e2bcc6) [SDT event] sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event] [root@jouet ~]# So, these are not really 'pre-defined events', i.e. we can't use them with 'perf record --event': [root@jouet ~]# perf record --event sdt_libstdcxx:catch* event syntax error: 'sdt_libstdcxx:catch*' \___ unknown tracepoint Error: File /sys/kernel/debug/tracing/events/sdt_libstdcxx/catch* not found. Hint: Perhaps this kernel misses some CONFIG_ setting to enable this feature?. <SNIP> [root@jouet ~]# To have it really pre-defined we must use perf probe to get its definition from the cache and set it up in the kernel, creating the tracepoint to _then_ use it with 'perf record --event': [root@jouet ~]# perf probe -a sdt_libstdcxx:catch Semantic error :There is non-digit char in line number. <SNIP> Oops, there is another gotcha here, we need that pesky '%' character: [root@jouet ~]# perf probe -a %sdt_libstdcxx:catch Added new events: sdt_libstdcxx:catch (on %catch in /usr/bin/gcc) sdt_libstdcxx:catch_1 (on %catch in /usr/lib64/libstdc++.so.6.0.22) You can now use it in all perf tools, such as: perf record -e sdt_libstdcxx:catch_1 -aR sleep 1 [root@jouet ~]# But then we added _two_ events, one with the name we expected, the other one with a _ added, when doing the analysis we need to pay attention to who maps to who. And here is where we get to the point of this patch, which is to be able to disambiguate those definitions for 'catch' in the build-id cache, but first we need remove those events we just added: [root@jouet ~]# perf probe -d %sdt_libstdcxx:catch Oops, that didn't remove anything, we need to _remove_ that % char in this case: [root@jouet ~]# perf probe -d sdt_libstdcxx:catch Removed event: sdt_libstdcxx:catch And we need to remove the other event added, i.e. I forgot to add a * at the end: [root@jouet ~]# perf probe -d sdt_libstdcxx:catch* Removed event: sdt_libstdcxx:catch_1 [root@jouet ~]# Ok, disambiguating it using what is in this patch: [root@jouet ~]# perf list sdt_libstdcxx:catch List of pre-defined events (to be used in -e): sdt_libstdcxx:catch@/usr/bin/gcc(9a0730e2bcc6) [SDT event] sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event] [root@jouet ~]# [root@jouet ~]# perf probe -a %sdt_libstdcxx:catch@9a07 Added new event: sdt_libstdcxx:catch (on %catch in /usr/bin/gcc) You can now use it in all perf tools, such as: perf record -e sdt_libstdcxx:catch -aR sleep 1 [root@jouet ~]# perf probe -l sdt_libstdcxx:catch (on execute_cfa_program+1551@../../../libgcc/unwind-dw2.c in /usr/bin/gcc) [root@jouet ~]# Yeah, it works! But we need to try and simplify this :-) Update: Some aspects of this simplification take place in the following patches. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/146831793746.17065.13065062753978236612.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
837 lines
19 KiB
C
837 lines
19 KiB
C
/*
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* build-id.c
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*
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* build-id support
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*
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* Copyright (C) 2009, 2010 Red Hat Inc.
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* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "util.h"
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#include <stdio.h>
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#include "build-id.h"
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#include "event.h"
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#include "symbol.h"
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#include <linux/kernel.h>
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#include "debug.h"
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#include "session.h"
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#include "tool.h"
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#include "header.h"
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#include "vdso.h"
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#include "probe-file.h"
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static bool no_buildid_cache;
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int build_id__mark_dso_hit(struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_evsel *evsel __maybe_unused,
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struct machine *machine)
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{
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struct addr_location al;
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struct thread *thread = machine__findnew_thread(machine, sample->pid,
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sample->tid);
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if (thread == NULL) {
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pr_err("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, &al);
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if (al.map != NULL)
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al.map->dso->hit = 1;
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thread__put(thread);
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return 0;
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}
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static int perf_event__exit_del_thread(struct perf_tool *tool __maybe_unused,
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union perf_event *event,
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struct perf_sample *sample
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__maybe_unused,
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struct machine *machine)
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{
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struct thread *thread = machine__findnew_thread(machine,
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event->fork.pid,
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event->fork.tid);
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dump_printf("(%d:%d):(%d:%d)\n", event->fork.pid, event->fork.tid,
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event->fork.ppid, event->fork.ptid);
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if (thread) {
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machine__remove_thread(machine, thread);
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thread__put(thread);
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}
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return 0;
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}
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struct perf_tool build_id__mark_dso_hit_ops = {
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.sample = build_id__mark_dso_hit,
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.mmap = perf_event__process_mmap,
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.mmap2 = perf_event__process_mmap2,
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.fork = perf_event__process_fork,
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.exit = perf_event__exit_del_thread,
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.attr = perf_event__process_attr,
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.build_id = perf_event__process_build_id,
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.ordered_events = true,
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};
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int build_id__sprintf(const u8 *build_id, int len, char *bf)
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{
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char *bid = bf;
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const u8 *raw = build_id;
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int i;
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for (i = 0; i < len; ++i) {
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sprintf(bid, "%02x", *raw);
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++raw;
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bid += 2;
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}
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return (bid - bf) + 1;
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}
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int sysfs__sprintf_build_id(const char *root_dir, char *sbuild_id)
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{
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char notes[PATH_MAX];
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u8 build_id[BUILD_ID_SIZE];
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int ret;
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if (!root_dir)
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root_dir = "";
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scnprintf(notes, sizeof(notes), "%s/sys/kernel/notes", root_dir);
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ret = sysfs__read_build_id(notes, build_id, sizeof(build_id));
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if (ret < 0)
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return ret;
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return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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}
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int filename__sprintf_build_id(const char *pathname, char *sbuild_id)
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{
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u8 build_id[BUILD_ID_SIZE];
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int ret;
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ret = filename__read_build_id(pathname, build_id, sizeof(build_id));
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if (ret < 0)
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return ret;
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else if (ret != sizeof(build_id))
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return -EINVAL;
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return build_id__sprintf(build_id, sizeof(build_id), sbuild_id);
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}
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/* asnprintf consolidates asprintf and snprintf */
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static int asnprintf(char **strp, size_t size, const char *fmt, ...)
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{
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va_list ap;
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int ret;
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if (!strp)
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return -EINVAL;
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va_start(ap, fmt);
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if (*strp)
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ret = vsnprintf(*strp, size, fmt, ap);
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else
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ret = vasprintf(strp, fmt, ap);
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va_end(ap);
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return ret;
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}
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char *build_id_cache__kallsyms_path(const char *sbuild_id, char *bf,
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size_t size)
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{
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bool retry_old = true;
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snprintf(bf, size, "%s/%s/%s/kallsyms",
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buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
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retry:
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if (!access(bf, F_OK))
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return bf;
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if (retry_old) {
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/* Try old style kallsyms cache */
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snprintf(bf, size, "%s/%s/%s",
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buildid_dir, DSO__NAME_KALLSYMS, sbuild_id);
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retry_old = false;
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goto retry;
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}
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return NULL;
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}
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char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size)
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{
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char *tmp = bf;
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int ret = asnprintf(&bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
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sbuild_id, sbuild_id + 2);
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if (ret < 0 || (tmp && size < (unsigned int)ret))
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return NULL;
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return bf;
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}
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char *build_id_cache__origname(const char *sbuild_id)
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{
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char *linkname;
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char buf[PATH_MAX];
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char *ret = NULL, *p;
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size_t offs = 5; /* == strlen("../..") */
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linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
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if (!linkname)
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return NULL;
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if (readlink(linkname, buf, PATH_MAX) < 0)
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goto out;
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/* The link should be "../..<origpath>/<sbuild_id>" */
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p = strrchr(buf, '/'); /* Cut off the "/<sbuild_id>" */
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if (p && (p > buf + offs)) {
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*p = '\0';
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if (buf[offs + 1] == '[')
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offs++; /*
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* This is a DSO name, like [kernel.kallsyms].
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* Skip the first '/', since this is not the
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* cache of a regular file.
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*/
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ret = strdup(buf + offs); /* Skip "../..[/]" */
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}
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out:
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free(linkname);
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return ret;
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}
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/* Check if the given build_id cache is valid on current running system */
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static bool build_id_cache__valid_id(char *sbuild_id)
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{
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char real_sbuild_id[SBUILD_ID_SIZE] = "";
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char *pathname;
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int ret = 0;
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bool result = false;
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pathname = build_id_cache__origname(sbuild_id);
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if (!pathname)
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return false;
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if (!strcmp(pathname, DSO__NAME_KALLSYMS))
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ret = sysfs__sprintf_build_id("/", real_sbuild_id);
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else if (pathname[0] == '/')
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ret = filename__sprintf_build_id(pathname, real_sbuild_id);
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else
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ret = -EINVAL; /* Should we support other special DSO cache? */
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if (ret >= 0)
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result = (strcmp(sbuild_id, real_sbuild_id) == 0);
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free(pathname);
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return result;
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}
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static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
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{
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return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
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}
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char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
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{
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bool is_kallsyms = dso__is_kallsyms((struct dso *)dso);
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bool is_vdso = dso__is_vdso((struct dso *)dso);
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char sbuild_id[SBUILD_ID_SIZE];
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char *linkname;
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bool alloc = (bf == NULL);
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int ret;
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if (!dso->has_build_id)
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return NULL;
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build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
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linkname = build_id_cache__linkname(sbuild_id, NULL, 0);
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if (!linkname)
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return NULL;
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/* Check if old style build_id cache */
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if (is_regular_file(linkname))
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ret = asnprintf(&bf, size, "%s", linkname);
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else
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ret = asnprintf(&bf, size, "%s/%s", linkname,
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build_id_cache__basename(is_kallsyms, is_vdso));
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if (ret < 0 || (!alloc && size < (unsigned int)ret))
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bf = NULL;
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free(linkname);
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return bf;
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}
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bool dso__build_id_is_kmod(const struct dso *dso, char *bf, size_t size)
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{
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char *id_name = NULL, *ch;
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struct stat sb;
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char sbuild_id[SBUILD_ID_SIZE];
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if (!dso->has_build_id)
|
|
goto err;
|
|
|
|
build_id__sprintf(dso->build_id, sizeof(dso->build_id), sbuild_id);
|
|
id_name = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
if (!id_name)
|
|
goto err;
|
|
if (access(id_name, F_OK))
|
|
goto err;
|
|
if (lstat(id_name, &sb) == -1)
|
|
goto err;
|
|
if ((size_t)sb.st_size > size - 1)
|
|
goto err;
|
|
if (readlink(id_name, bf, size - 1) < 0)
|
|
goto err;
|
|
|
|
bf[sb.st_size] = '\0';
|
|
|
|
/*
|
|
* link should be:
|
|
* ../../lib/modules/4.4.0-rc4/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko/a09fe3eb3147dafa4e3b31dbd6257e4d696bdc92
|
|
*/
|
|
ch = strrchr(bf, '/');
|
|
if (!ch)
|
|
goto err;
|
|
if (ch - 3 < bf)
|
|
goto err;
|
|
|
|
free(id_name);
|
|
return strncmp(".ko", ch - 3, 3) == 0;
|
|
err:
|
|
pr_err("Invalid build id: %s\n", id_name ? :
|
|
dso->long_name ? :
|
|
dso->short_name ? :
|
|
"[unknown]");
|
|
free(id_name);
|
|
return false;
|
|
}
|
|
|
|
#define dsos__for_each_with_build_id(pos, head) \
|
|
list_for_each_entry(pos, head, node) \
|
|
if (!pos->has_build_id) \
|
|
continue; \
|
|
else
|
|
|
|
static int write_buildid(const char *name, size_t name_len, u8 *build_id,
|
|
pid_t pid, u16 misc, int fd)
|
|
{
|
|
int err;
|
|
struct build_id_event b;
|
|
size_t len;
|
|
|
|
len = name_len + 1;
|
|
len = PERF_ALIGN(len, NAME_ALIGN);
|
|
|
|
memset(&b, 0, sizeof(b));
|
|
memcpy(&b.build_id, build_id, BUILD_ID_SIZE);
|
|
b.pid = pid;
|
|
b.header.misc = misc;
|
|
b.header.size = sizeof(b) + len;
|
|
|
|
err = writen(fd, &b, sizeof(b));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return write_padded(fd, name, name_len + 1, len);
|
|
}
|
|
|
|
static int machine__write_buildid_table(struct machine *machine, int fd)
|
|
{
|
|
int err = 0;
|
|
char nm[PATH_MAX];
|
|
struct dso *pos;
|
|
u16 kmisc = PERF_RECORD_MISC_KERNEL,
|
|
umisc = PERF_RECORD_MISC_USER;
|
|
|
|
if (!machine__is_host(machine)) {
|
|
kmisc = PERF_RECORD_MISC_GUEST_KERNEL;
|
|
umisc = PERF_RECORD_MISC_GUEST_USER;
|
|
}
|
|
|
|
dsos__for_each_with_build_id(pos, &machine->dsos.head) {
|
|
const char *name;
|
|
size_t name_len;
|
|
bool in_kernel = false;
|
|
|
|
if (!pos->hit && !dso__is_vdso(pos))
|
|
continue;
|
|
|
|
if (dso__is_vdso(pos)) {
|
|
name = pos->short_name;
|
|
name_len = pos->short_name_len;
|
|
} else if (dso__is_kcore(pos)) {
|
|
machine__mmap_name(machine, nm, sizeof(nm));
|
|
name = nm;
|
|
name_len = strlen(nm);
|
|
} else {
|
|
name = pos->long_name;
|
|
name_len = pos->long_name_len;
|
|
}
|
|
|
|
in_kernel = pos->kernel ||
|
|
is_kernel_module(name,
|
|
PERF_RECORD_MISC_CPUMODE_UNKNOWN);
|
|
err = write_buildid(name, name_len, pos->build_id, machine->pid,
|
|
in_kernel ? kmisc : umisc, fd);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int perf_session__write_buildid_table(struct perf_session *session, int fd)
|
|
{
|
|
struct rb_node *nd;
|
|
int err = machine__write_buildid_table(&session->machines.host, fd);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
err = machine__write_buildid_table(pos, fd);
|
|
if (err)
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int __dsos__hit_all(struct list_head *head)
|
|
{
|
|
struct dso *pos;
|
|
|
|
list_for_each_entry(pos, head, node)
|
|
pos->hit = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int machine__hit_all_dsos(struct machine *machine)
|
|
{
|
|
return __dsos__hit_all(&machine->dsos.head);
|
|
}
|
|
|
|
int dsos__hit_all(struct perf_session *session)
|
|
{
|
|
struct rb_node *nd;
|
|
int err;
|
|
|
|
err = machine__hit_all_dsos(&session->machines.host);
|
|
if (err)
|
|
return err;
|
|
|
|
for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
|
|
err = machine__hit_all_dsos(pos);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void disable_buildid_cache(void)
|
|
{
|
|
no_buildid_cache = true;
|
|
}
|
|
|
|
static bool lsdir_bid_head_filter(const char *name __maybe_unused,
|
|
struct dirent *d __maybe_unused)
|
|
{
|
|
return (strlen(d->d_name) == 2) &&
|
|
isxdigit(d->d_name[0]) && isxdigit(d->d_name[1]);
|
|
}
|
|
|
|
static bool lsdir_bid_tail_filter(const char *name __maybe_unused,
|
|
struct dirent *d __maybe_unused)
|
|
{
|
|
int i = 0;
|
|
while (isxdigit(d->d_name[i]) && i < SBUILD_ID_SIZE - 3)
|
|
i++;
|
|
return (i == SBUILD_ID_SIZE - 3) && (d->d_name[i] == '\0');
|
|
}
|
|
|
|
struct strlist *build_id_cache__list_all(bool validonly)
|
|
{
|
|
struct strlist *toplist, *linklist = NULL, *bidlist;
|
|
struct str_node *nd, *nd2;
|
|
char *topdir, *linkdir = NULL;
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
/* for filename__ functions */
|
|
if (validonly)
|
|
symbol__init(NULL);
|
|
|
|
/* Open the top-level directory */
|
|
if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
|
|
return NULL;
|
|
|
|
bidlist = strlist__new(NULL, NULL);
|
|
if (!bidlist)
|
|
goto out;
|
|
|
|
toplist = lsdir(topdir, lsdir_bid_head_filter);
|
|
if (!toplist) {
|
|
pr_debug("Error in lsdir(%s): %d\n", topdir, errno);
|
|
/* If there is no buildid cache, return an empty list */
|
|
if (errno == ENOENT)
|
|
goto out;
|
|
goto err_out;
|
|
}
|
|
|
|
strlist__for_each_entry(nd, toplist) {
|
|
if (asprintf(&linkdir, "%s/%s", topdir, nd->s) < 0)
|
|
goto err_out;
|
|
/* Open the lower-level directory */
|
|
linklist = lsdir(linkdir, lsdir_bid_tail_filter);
|
|
if (!linklist) {
|
|
pr_debug("Error in lsdir(%s): %d\n", linkdir, errno);
|
|
goto err_out;
|
|
}
|
|
strlist__for_each_entry(nd2, linklist) {
|
|
if (snprintf(sbuild_id, SBUILD_ID_SIZE, "%s%s",
|
|
nd->s, nd2->s) != SBUILD_ID_SIZE - 1)
|
|
goto err_out;
|
|
if (validonly && !build_id_cache__valid_id(sbuild_id))
|
|
continue;
|
|
if (strlist__add(bidlist, sbuild_id) < 0)
|
|
goto err_out;
|
|
}
|
|
strlist__delete(linklist);
|
|
zfree(&linkdir);
|
|
}
|
|
|
|
out_free:
|
|
strlist__delete(toplist);
|
|
out:
|
|
free(topdir);
|
|
|
|
return bidlist;
|
|
|
|
err_out:
|
|
strlist__delete(linklist);
|
|
zfree(&linkdir);
|
|
strlist__delete(bidlist);
|
|
bidlist = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
static bool str_is_build_id(const char *maybe_sbuild_id, size_t len)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
if (!isxdigit(maybe_sbuild_id[i]))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* Return the valid complete build-id */
|
|
char *build_id_cache__complement(const char *incomplete_sbuild_id)
|
|
{
|
|
struct strlist *bidlist;
|
|
struct str_node *nd, *cand = NULL;
|
|
char *sbuild_id = NULL;
|
|
size_t len = strlen(incomplete_sbuild_id);
|
|
|
|
if (len >= SBUILD_ID_SIZE ||
|
|
!str_is_build_id(incomplete_sbuild_id, len))
|
|
return NULL;
|
|
|
|
bidlist = build_id_cache__list_all(true);
|
|
if (!bidlist)
|
|
return NULL;
|
|
|
|
strlist__for_each_entry(nd, bidlist) {
|
|
if (strncmp(nd->s, incomplete_sbuild_id, len) != 0)
|
|
continue;
|
|
if (cand) { /* Error: There are more than 2 candidates. */
|
|
cand = NULL;
|
|
break;
|
|
}
|
|
cand = nd;
|
|
}
|
|
if (cand)
|
|
sbuild_id = strdup(cand->s);
|
|
strlist__delete(bidlist);
|
|
|
|
return sbuild_id;
|
|
}
|
|
|
|
char *build_id_cache__cachedir(const char *sbuild_id, const char *name,
|
|
bool is_kallsyms, bool is_vdso)
|
|
{
|
|
char *realname = (char *)name, *filename;
|
|
bool slash = is_kallsyms || is_vdso;
|
|
|
|
if (!slash) {
|
|
realname = realpath(name, NULL);
|
|
if (!realname)
|
|
return NULL;
|
|
}
|
|
|
|
if (asprintf(&filename, "%s%s%s%s%s", buildid_dir, slash ? "/" : "",
|
|
is_vdso ? DSO__NAME_VDSO : realname,
|
|
sbuild_id ? "/" : "", sbuild_id ?: "") < 0)
|
|
filename = NULL;
|
|
|
|
if (!slash)
|
|
free(realname);
|
|
|
|
return filename;
|
|
}
|
|
|
|
int build_id_cache__list_build_ids(const char *pathname,
|
|
struct strlist **result)
|
|
{
|
|
char *dir_name;
|
|
int ret = 0;
|
|
|
|
dir_name = build_id_cache__cachedir(NULL, pathname, false, false);
|
|
if (!dir_name)
|
|
return -ENOMEM;
|
|
|
|
*result = lsdir(dir_name, lsdir_no_dot_filter);
|
|
if (!*result)
|
|
ret = -errno;
|
|
free(dir_name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if defined(HAVE_LIBELF_SUPPORT) && defined(HAVE_GELF_GETNOTE_SUPPORT)
|
|
static int build_id_cache__add_sdt_cache(const char *sbuild_id,
|
|
const char *realname)
|
|
{
|
|
struct probe_cache *cache;
|
|
int ret;
|
|
|
|
cache = probe_cache__new(sbuild_id);
|
|
if (!cache)
|
|
return -1;
|
|
|
|
ret = probe_cache__scan_sdt(cache, realname);
|
|
if (ret >= 0) {
|
|
pr_debug("Found %d SDTs in %s\n", ret, realname);
|
|
if (probe_cache__commit(cache) < 0)
|
|
ret = -1;
|
|
}
|
|
probe_cache__delete(cache);
|
|
return ret;
|
|
}
|
|
#else
|
|
#define build_id_cache__add_sdt_cache(sbuild_id, realname) (0)
|
|
#endif
|
|
|
|
int build_id_cache__add_s(const char *sbuild_id, const char *name,
|
|
bool is_kallsyms, bool is_vdso)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *realname = NULL, *filename = NULL, *dir_name = NULL,
|
|
*linkname = zalloc(size), *tmp;
|
|
int err = -1;
|
|
|
|
if (!is_kallsyms) {
|
|
realname = realpath(name, NULL);
|
|
if (!realname)
|
|
goto out_free;
|
|
}
|
|
|
|
dir_name = build_id_cache__cachedir(sbuild_id, name,
|
|
is_kallsyms, is_vdso);
|
|
if (!dir_name)
|
|
goto out_free;
|
|
|
|
/* Remove old style build-id cache */
|
|
if (is_regular_file(dir_name))
|
|
if (unlink(dir_name))
|
|
goto out_free;
|
|
|
|
if (mkdir_p(dir_name, 0755))
|
|
goto out_free;
|
|
|
|
/* Save the allocated buildid dirname */
|
|
if (asprintf(&filename, "%s/%s", dir_name,
|
|
build_id_cache__basename(is_kallsyms, is_vdso)) < 0) {
|
|
filename = NULL;
|
|
goto out_free;
|
|
}
|
|
|
|
if (access(filename, F_OK)) {
|
|
if (is_kallsyms) {
|
|
if (copyfile("/proc/kallsyms", filename))
|
|
goto out_free;
|
|
} else if (link(realname, filename) && errno != EEXIST &&
|
|
copyfile(name, filename))
|
|
goto out_free;
|
|
}
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
tmp = strrchr(linkname, '/');
|
|
*tmp = '\0';
|
|
|
|
if (access(linkname, X_OK) && mkdir_p(linkname, 0755))
|
|
goto out_free;
|
|
|
|
*tmp = '/';
|
|
tmp = dir_name + strlen(buildid_dir) - 5;
|
|
memcpy(tmp, "../..", 5);
|
|
|
|
if (symlink(tmp, linkname) == 0)
|
|
err = 0;
|
|
|
|
/* Update SDT cache : error is just warned */
|
|
if (build_id_cache__add_sdt_cache(sbuild_id, realname) < 0)
|
|
pr_debug("Failed to update/scan SDT cache for %s\n", realname);
|
|
|
|
out_free:
|
|
if (!is_kallsyms)
|
|
free(realname);
|
|
free(filename);
|
|
free(dir_name);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int build_id_cache__add_b(const u8 *build_id, size_t build_id_size,
|
|
const char *name, bool is_kallsyms,
|
|
bool is_vdso)
|
|
{
|
|
char sbuild_id[SBUILD_ID_SIZE];
|
|
|
|
build_id__sprintf(build_id, build_id_size, sbuild_id);
|
|
|
|
return build_id_cache__add_s(sbuild_id, name, is_kallsyms, is_vdso);
|
|
}
|
|
|
|
bool build_id_cache__cached(const char *sbuild_id)
|
|
{
|
|
bool ret = false;
|
|
char *filename = build_id_cache__linkname(sbuild_id, NULL, 0);
|
|
|
|
if (filename && !access(filename, F_OK))
|
|
ret = true;
|
|
free(filename);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int build_id_cache__remove_s(const char *sbuild_id)
|
|
{
|
|
const size_t size = PATH_MAX;
|
|
char *filename = zalloc(size),
|
|
*linkname = zalloc(size), *tmp;
|
|
int err = -1;
|
|
|
|
if (filename == NULL || linkname == NULL)
|
|
goto out_free;
|
|
|
|
if (!build_id_cache__linkname(sbuild_id, linkname, size))
|
|
goto out_free;
|
|
|
|
if (access(linkname, F_OK))
|
|
goto out_free;
|
|
|
|
if (readlink(linkname, filename, size - 1) < 0)
|
|
goto out_free;
|
|
|
|
if (unlink(linkname))
|
|
goto out_free;
|
|
|
|
/*
|
|
* Since the link is relative, we must make it absolute:
|
|
*/
|
|
tmp = strrchr(linkname, '/') + 1;
|
|
snprintf(tmp, size - (tmp - linkname), "%s", filename);
|
|
|
|
if (rm_rf(linkname))
|
|
goto out_free;
|
|
|
|
err = 0;
|
|
out_free:
|
|
free(filename);
|
|
free(linkname);
|
|
return err;
|
|
}
|
|
|
|
static int dso__cache_build_id(struct dso *dso, struct machine *machine)
|
|
{
|
|
bool is_kallsyms = dso__is_kallsyms(dso);
|
|
bool is_vdso = dso__is_vdso(dso);
|
|
const char *name = dso->long_name;
|
|
char nm[PATH_MAX];
|
|
|
|
if (dso__is_kcore(dso)) {
|
|
is_kallsyms = true;
|
|
machine__mmap_name(machine, nm, sizeof(nm));
|
|
name = nm;
|
|
}
|
|
return build_id_cache__add_b(dso->build_id, sizeof(dso->build_id), name,
|
|
is_kallsyms, is_vdso);
|
|
}
|
|
|
|
static int __dsos__cache_build_ids(struct list_head *head,
|
|
struct machine *machine)
|
|
{
|
|
struct dso *pos;
|
|
int err = 0;
|
|
|
|
dsos__for_each_with_build_id(pos, head)
|
|
if (dso__cache_build_id(pos, machine))
|
|
err = -1;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int machine__cache_build_ids(struct machine *machine)
|
|
{
|
|
return __dsos__cache_build_ids(&machine->dsos.head, machine);
|
|
}
|
|
|
|
int perf_session__cache_build_ids(struct perf_session *session)
|
|
{
|
|
struct rb_node *nd;
|
|
int ret;
|
|
|
|
if (no_buildid_cache)
|
|
return 0;
|
|
|
|
if (mkdir(buildid_dir, 0755) != 0 && errno != EEXIST)
|
|
return -1;
|
|
|
|
ret = machine__cache_build_ids(&session->machines.host);
|
|
|
|
for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__cache_build_ids(pos);
|
|
}
|
|
return ret ? -1 : 0;
|
|
}
|
|
|
|
static bool machine__read_build_ids(struct machine *machine, bool with_hits)
|
|
{
|
|
return __dsos__read_build_ids(&machine->dsos.head, with_hits);
|
|
}
|
|
|
|
bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
|
|
{
|
|
struct rb_node *nd;
|
|
bool ret = machine__read_build_ids(&session->machines.host, with_hits);
|
|
|
|
for (nd = rb_first(&session->machines.guests); nd; nd = rb_next(nd)) {
|
|
struct machine *pos = rb_entry(nd, struct machine, rb_node);
|
|
ret |= machine__read_build_ids(pos, with_hits);
|
|
}
|
|
|
|
return ret;
|
|
}
|