mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2025-01-27 08:12:48 +07:00
72363540c0
Support multiprobe event if the event is based on function and lines and
kernel supports it. In this case, perf probe creates the first probe
with an event, and tries to append following probes on that event, since
those probes must be on the same source code line.
Before this patch;
# perf probe -a vfs_read:18
Added new events:
probe:vfs_read_L18 (on vfs_read:18)
probe:vfs_read_L18_1 (on vfs_read:18)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read_L18_1 -aR sleep 1
#
After this patch (on multiprobe supported kernel)
# perf probe -a vfs_read:18
Added new events:
probe:vfs_read_L18 (on vfs_read:18)
probe:vfs_read_L18 (on vfs_read:18)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read_L18 -aR sleep 1
#
Committer testing:
On a kernel that doesn't support multiprobe events, after this patch:
# uname -a
Linux quaco 5.3.8-200.fc30.x86_64 #1 SMP Tue Oct 29 14:46:22 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
# grep append /sys/kernel/debug/tracing/README
be modified by appending '.descending' or '.ascending' to a
can be modified by appending any of the following modifiers
#
# perf probe -a vfs_read:18
Added new events:
probe:vfs_read_L18 (on vfs_read:18)
probe:vfs_read_L18_1 (on vfs_read:18)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read_L18_1 -aR sleep 1
# perf probe -l
probe:vfs_read_L18 (on vfs_read:18@fs/read_write.c)
probe:vfs_read_L18_1 (on vfs_read:18@fs/read_write.c)
#
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Link: http://lore.kernel.org/lkml/157406475010.24476.586290752591512351.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __PROBE_FILE_H
|
|
#define __PROBE_FILE_H
|
|
|
|
#include "probe-event.h"
|
|
|
|
struct strlist;
|
|
struct strfilter;
|
|
|
|
/* Cache of probe definitions */
|
|
struct probe_cache_entry {
|
|
struct list_head node;
|
|
bool sdt;
|
|
struct perf_probe_event pev;
|
|
char *spev;
|
|
struct strlist *tevlist;
|
|
};
|
|
|
|
struct probe_cache {
|
|
int fd;
|
|
struct list_head entries;
|
|
};
|
|
|
|
enum probe_type {
|
|
PROBE_TYPE_U = 0,
|
|
PROBE_TYPE_S,
|
|
PROBE_TYPE_X,
|
|
PROBE_TYPE_STRING,
|
|
PROBE_TYPE_BITFIELD,
|
|
PROBE_TYPE_END,
|
|
};
|
|
|
|
#define PF_FL_UPROBE 1
|
|
#define PF_FL_RW 2
|
|
#define for_each_probe_cache_entry(entry, pcache) \
|
|
list_for_each_entry(entry, &pcache->entries, node)
|
|
|
|
/* probe-file.c depends on libelf */
|
|
#ifdef HAVE_LIBELF_SUPPORT
|
|
int open_trace_file(const char *trace_file, bool readwrite);
|
|
int probe_file__open(int flag);
|
|
int probe_file__open_both(int *kfd, int *ufd, int flag);
|
|
struct strlist *probe_file__get_namelist(int fd);
|
|
struct strlist *probe_file__get_rawlist(int fd);
|
|
int probe_file__add_event(int fd, struct probe_trace_event *tev);
|
|
|
|
int probe_file__del_events(int fd, struct strfilter *filter);
|
|
int probe_file__get_events(int fd, struct strfilter *filter,
|
|
struct strlist *plist);
|
|
int probe_file__del_strlist(int fd, struct strlist *namelist);
|
|
|
|
int probe_cache_entry__get_event(struct probe_cache_entry *entry,
|
|
struct probe_trace_event **tevs);
|
|
|
|
struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi);
|
|
int probe_cache__add_entry(struct probe_cache *pcache,
|
|
struct perf_probe_event *pev,
|
|
struct probe_trace_event *tevs, int ntevs);
|
|
int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname);
|
|
int probe_cache__commit(struct probe_cache *pcache);
|
|
void probe_cache__purge(struct probe_cache *pcache);
|
|
void probe_cache__delete(struct probe_cache *pcache);
|
|
int probe_cache__filter_purge(struct probe_cache *pcache,
|
|
struct strfilter *filter);
|
|
struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
|
|
struct perf_probe_event *pev);
|
|
struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
|
|
const char *group, const char *event);
|
|
int probe_cache__show_all_caches(struct strfilter *filter);
|
|
bool probe_type_is_available(enum probe_type type);
|
|
bool kretprobe_offset_is_supported(void);
|
|
bool uprobe_ref_ctr_is_supported(void);
|
|
bool user_access_is_supported(void);
|
|
bool multiprobe_event_is_supported(void);
|
|
#else /* ! HAVE_LIBELF_SUPPORT */
|
|
static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused, struct nsinfo *nsi __maybe_unused)
|
|
{
|
|
return NULL;
|
|
}
|
|
#define probe_cache__delete(pcache) do {} while (0)
|
|
#endif
|
|
#endif
|