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perf: Add attribute to filter out callchains 

Introducing following bits to the the perf_event_attr struct:

  - exclude_callchain_kernel to filter out kernel callchain
    from the sample dump

  - exclude_callchain_user to filter out user callchain
    from the sample dump

We need to be able to disable standard user callchain dump when we use
the dwarf cfi callchain mode, because frame pointer based user
callchains are useless in this mode.

Implementing also exclude_callchain_kernel to have complete set of
options.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
[ Added kernel callchains filtering ]
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Arun Sharma <asharma@fb.com>
Cc: Benjamin Redelings <benjamin.redelings@nescent.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/r/1344345647-11536-7-git-send-email-jolsa@redhat.com
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Frederic Weisbecker 2012-08-07 15:20:41 +02:00 committed by Arnaldo Carvalho de Melo
parent c5ebcedb56
commit d077526485
2 changed files with 27 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/perf_event.h
View File

@ -268,7 +268,10 @@ struct perf_event_attr {
exclude_host : 1, /* don't count in host */
exclude_guest : 1, /* don't count in guest */
__reserved_1 : 43;
exclude_callchain_kernel : 1, /* exclude kernel callchains */
exclude_callchain_user : 1, /* exclude user callchains */
__reserved_1 : 41;
union {
__u32 wakeup_events; /* wakeup every n events */

36
kernel/events/callchain.c
View File

@ -159,6 +159,11 @@ perf_callchain(struct perf_event *event, struct pt_regs *regs)
int rctx;
struct perf_callchain_entry *entry;
int kernel = !event->attr.exclude_callchain_kernel;
int user = !event->attr.exclude_callchain_user;
if (!kernel && !user)
return NULL;
entry = get_callchain_entry(&rctx);
if (rctx == -1)
@ -169,24 +174,29 @@ perf_callchain(struct perf_event *event, struct pt_regs *regs)
entry->nr = 0;
if (!user_mode(regs)) {
if (kernel && !user_mode(regs)) {
perf_callchain_store(entry, PERF_CONTEXT_KERNEL);
perf_callchain_kernel(entry, regs);
if (current->mm)
regs = task_pt_regs(current);
else
regs = NULL;
}
if (regs) {
/*
* Disallow cross-task user callchains.
*/
if (event->ctx->task && event->ctx->task != current)
goto exit_put;
if (user) {
if (!user_mode(regs)) {
if (current->mm)
regs = task_pt_regs(current);
else
regs = NULL;
}
perf_callchain_store(entry, PERF_CONTEXT_USER);
perf_callchain_user(entry, regs);
if (regs) {
/*
* Disallow cross-task user callchains.
*/
if (event->ctx->task && event->ctx->task != current)
goto exit_put;
perf_callchain_store(entry, PERF_CONTEXT_USER);
perf_callchain_user(entry, regs);
}
}
exit_put: