![Masami Hiramatsu](/assets/img/avatar_default.png)
Allow to add events on the local functions without debuginfo. (With the debuginfo, we can add events even on inlined functions) Currently, probing on local functions requires debuginfo to locate actual address. It is also possible without debuginfo since we have symbol maps. Without this change; ---- # ./perf probe -a t_show Added new event: probe:t_show (on t_show) You can now use it in all perf tools, such as: perf record -e probe:t_show -aR sleep 1 # ./perf probe -x perf -a identity__map_ip no symbols found in /kbuild/ksrc/linux-3/tools/perf/perf, maybe install a debug package? Failed to load map. Error: Failed to add events. (-22) ---- As the above results, perf probe just put one event on the first found symbol for kprobe event. Moreover, for uprobe event, perf probe failed to find local functions. With this change; ---- # ./perf probe -a t_show Added new events: probe:t_show (on t_show) probe:t_show_1 (on t_show) probe:t_show_2 (on t_show) probe:t_show_3 (on t_show) You can now use it in all perf tools, such as: perf record -e probe:t_show_3 -aR sleep 1 # ./perf probe -x perf -a identity__map_ip Added new events: probe_perf:identity__map_ip (on identity__map_ip in /kbuild/ksrc/linux-3/tools/perf/perf) probe_perf:identity__map_ip_1 (on identity__map_ip in /kbuild/ksrc/linux-3/tools/perf/perf) probe_perf:identity__map_ip_2 (on identity__map_ip in /kbuild/ksrc/linux-3/tools/perf/perf) probe_perf:identity__map_ip_3 (on identity__map_ip in /kbuild/ksrc/linux-3/tools/perf/perf) You can now use it in all perf tools, such as: perf record -e probe_perf:identity__map_ip_3 -aR sleep 1 ---- Now we succeed to put events on every given local functions for both kprobes and uprobes. :) Note that this also introduces some symbol rbtree iteration macros; symbols__for_each, dso__for_each_symbol, and map__for_each_symbol. These are for walking through the symbol list in a map. Changes from v2: - Fix add_exec_to_probe_trace_events() not to convert address to tp->symbol any more. - Fix to set kernel probes based on ref_reloc_sym. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: David Ahern <dsahern@gmail.com> Cc: "David A. Long" <dave.long@linaro.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: yrl.pp-manager.tt@hitachi.com Link: http://lkml.kernel.org/r/20140206053225.29635.15026.stgit@kbuild-fedora.yrl.intra.hitachi.co.jp Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
185 lines
5.2 KiB
C
185 lines
5.2 KiB
C
#ifndef __PERF_DSO
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#define __PERF_DSO
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#include <linux/types.h>
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#include <linux/rbtree.h>
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#include <stdbool.h>
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#include "types.h"
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#include "map.h"
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#include "build-id.h"
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enum dso_binary_type {
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DSO_BINARY_TYPE__KALLSYMS = 0,
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DSO_BINARY_TYPE__GUEST_KALLSYMS,
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DSO_BINARY_TYPE__VMLINUX,
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DSO_BINARY_TYPE__GUEST_VMLINUX,
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DSO_BINARY_TYPE__JAVA_JIT,
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DSO_BINARY_TYPE__DEBUGLINK,
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DSO_BINARY_TYPE__BUILD_ID_CACHE,
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DSO_BINARY_TYPE__FEDORA_DEBUGINFO,
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DSO_BINARY_TYPE__UBUNTU_DEBUGINFO,
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DSO_BINARY_TYPE__BUILDID_DEBUGINFO,
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DSO_BINARY_TYPE__SYSTEM_PATH_DSO,
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DSO_BINARY_TYPE__GUEST_KMODULE,
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DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE,
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DSO_BINARY_TYPE__KCORE,
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DSO_BINARY_TYPE__GUEST_KCORE,
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DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
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DSO_BINARY_TYPE__NOT_FOUND,
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};
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enum dso_kernel_type {
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DSO_TYPE_USER = 0,
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DSO_TYPE_KERNEL,
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DSO_TYPE_GUEST_KERNEL
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};
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enum dso_swap_type {
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DSO_SWAP__UNSET,
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DSO_SWAP__NO,
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DSO_SWAP__YES,
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};
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#define DSO__SWAP(dso, type, val) \
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({ \
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type ____r = val; \
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BUG_ON(dso->needs_swap == DSO_SWAP__UNSET); \
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if (dso->needs_swap == DSO_SWAP__YES) { \
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switch (sizeof(____r)) { \
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case 2: \
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____r = bswap_16(val); \
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break; \
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case 4: \
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____r = bswap_32(val); \
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break; \
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case 8: \
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____r = bswap_64(val); \
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break; \
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default: \
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BUG_ON(1); \
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} \
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} \
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____r; \
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})
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#define DSO__DATA_CACHE_SIZE 4096
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#define DSO__DATA_CACHE_MASK ~(DSO__DATA_CACHE_SIZE - 1)
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struct dso_cache {
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struct rb_node rb_node;
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u64 offset;
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u64 size;
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char data[0];
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};
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struct dso {
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struct list_head node;
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struct rb_root symbols[MAP__NR_TYPES];
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struct rb_root symbol_names[MAP__NR_TYPES];
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struct rb_root cache;
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void *a2l;
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char *symsrc_filename;
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unsigned int a2l_fails;
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enum dso_kernel_type kernel;
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enum dso_swap_type needs_swap;
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enum dso_binary_type symtab_type;
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enum dso_binary_type binary_type;
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u8 adjust_symbols:1;
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u8 has_build_id:1;
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u8 has_srcline:1;
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u8 hit:1;
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u8 annotate_warned:1;
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u8 short_name_allocated:1;
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u8 long_name_allocated:1;
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u8 sorted_by_name;
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u8 loaded;
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u8 rel;
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u8 build_id[BUILD_ID_SIZE];
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const char *short_name;
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const char *long_name;
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u16 long_name_len;
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u16 short_name_len;
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char name[0];
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};
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/* dso__for_each_symbol - iterate over the symbols of given type
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*
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* @dso: the 'struct dso *' in which symbols itereated
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* @pos: the 'struct symbol *' to use as a loop cursor
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* @n: the 'struct rb_node *' to use as a temporary storage
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* @type: the 'enum map_type' type of symbols
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*/
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#define dso__for_each_symbol(dso, pos, n, type) \
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symbols__for_each_entry(&(dso)->symbols[(type)], pos, n)
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static inline void dso__set_loaded(struct dso *dso, enum map_type type)
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{
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dso->loaded |= (1 << type);
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}
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struct dso *dso__new(const char *name);
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void dso__delete(struct dso *dso);
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void dso__set_short_name(struct dso *dso, const char *name, bool name_allocated);
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void dso__set_long_name(struct dso *dso, const char *name, bool name_allocated);
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int dso__name_len(const struct dso *dso);
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bool dso__loaded(const struct dso *dso, enum map_type type);
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bool dso__sorted_by_name(const struct dso *dso, enum map_type type);
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void dso__set_sorted_by_name(struct dso *dso, enum map_type type);
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void dso__sort_by_name(struct dso *dso, enum map_type type);
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void dso__set_build_id(struct dso *dso, void *build_id);
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bool dso__build_id_equal(const struct dso *dso, u8 *build_id);
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void dso__read_running_kernel_build_id(struct dso *dso,
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struct machine *machine);
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int dso__kernel_module_get_build_id(struct dso *dso, const char *root_dir);
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char dso__symtab_origin(const struct dso *dso);
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int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type,
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char *root_dir, char *filename, size_t size);
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int dso__data_fd(struct dso *dso, struct machine *machine);
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ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
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u64 offset, u8 *data, ssize_t size);
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ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
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struct machine *machine, u64 addr,
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u8 *data, ssize_t size);
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struct map *dso__new_map(const char *name);
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struct dso *dso__kernel_findnew(struct machine *machine, const char *name,
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const char *short_name, int dso_type);
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void dsos__add(struct list_head *head, struct dso *dso);
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struct dso *dsos__find(const struct list_head *head, const char *name,
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bool cmp_short);
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struct dso *__dsos__findnew(struct list_head *head, const char *name);
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bool __dsos__read_build_ids(struct list_head *head, bool with_hits);
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size_t __dsos__fprintf_buildid(struct list_head *head, FILE *fp,
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bool (skip)(struct dso *dso, int parm), int parm);
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size_t __dsos__fprintf(struct list_head *head, FILE *fp);
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size_t dso__fprintf_buildid(struct dso *dso, FILE *fp);
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size_t dso__fprintf_symbols_by_name(struct dso *dso,
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enum map_type type, FILE *fp);
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size_t dso__fprintf(struct dso *dso, enum map_type type, FILE *fp);
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static inline bool dso__is_vmlinux(struct dso *dso)
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{
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return dso->binary_type == DSO_BINARY_TYPE__VMLINUX ||
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dso->binary_type == DSO_BINARY_TYPE__GUEST_VMLINUX;
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}
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static inline bool dso__is_kcore(struct dso *dso)
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{
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return dso->binary_type == DSO_BINARY_TYPE__KCORE ||
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dso->binary_type == DSO_BINARY_TYPE__GUEST_KCORE;
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}
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void dso__free_a2l(struct dso *dso);
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#endif /* __PERF_DSO */
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