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5a5e3d3cea
With this, perf buildid-cache will save SDT markers with reference
counter in probe cache. Perf probe will be able to probe markers
having reference counter. Ex,
# readelf -n /tmp/tick | grep -A1 loop2
Name: loop2
... Semaphore: 0x0000000010020036
# ./perf buildid-cache --add /tmp/tick
# ./perf probe sdt_tick:loop2
# ./perf stat -e sdt_tick:loop2 /tmp/tick
hi: 0
hi: 1
hi: 2
^C
Performance counter stats for '/tmp/tick':
3 sdt_tick:loop2
2.561851452 seconds time elapsed
Link: http://lkml.kernel.org/r/20180820044250.11659-5-ravi.bangoria@linux.ibm.com
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Song Liu <songliubraving@fb.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PROBE_FILE_H
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#define __PROBE_FILE_H
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#include "probe-event.h"
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struct strlist;
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struct strfilter;
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/* Cache of probe definitions */
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struct probe_cache_entry {
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struct list_head node;
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bool sdt;
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struct perf_probe_event pev;
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char *spev;
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struct strlist *tevlist;
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};
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struct probe_cache {
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int fd;
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struct list_head entries;
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};
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enum probe_type {
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PROBE_TYPE_U = 0,
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PROBE_TYPE_S,
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PROBE_TYPE_X,
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PROBE_TYPE_STRING,
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PROBE_TYPE_BITFIELD,
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PROBE_TYPE_END,
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};
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#define PF_FL_UPROBE 1
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#define PF_FL_RW 2
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#define for_each_probe_cache_entry(entry, pcache) \
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list_for_each_entry(entry, &pcache->entries, node)
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/* probe-file.c depends on libelf */
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#ifdef HAVE_LIBELF_SUPPORT
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int open_trace_file(const char *trace_file, bool readwrite);
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int probe_file__open(int flag);
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int probe_file__open_both(int *kfd, int *ufd, int flag);
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struct strlist *probe_file__get_namelist(int fd);
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struct strlist *probe_file__get_rawlist(int fd);
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int probe_file__add_event(int fd, struct probe_trace_event *tev);
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int probe_file__del_events(int fd, struct strfilter *filter);
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int probe_file__get_events(int fd, struct strfilter *filter,
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struct strlist *plist);
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int probe_file__del_strlist(int fd, struct strlist *namelist);
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int probe_cache_entry__get_event(struct probe_cache_entry *entry,
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struct probe_trace_event **tevs);
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struct probe_cache *probe_cache__new(const char *target, struct nsinfo *nsi);
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int probe_cache__add_entry(struct probe_cache *pcache,
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struct perf_probe_event *pev,
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struct probe_trace_event *tevs, int ntevs);
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int probe_cache__scan_sdt(struct probe_cache *pcache, const char *pathname);
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int probe_cache__commit(struct probe_cache *pcache);
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void probe_cache__purge(struct probe_cache *pcache);
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void probe_cache__delete(struct probe_cache *pcache);
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int probe_cache__filter_purge(struct probe_cache *pcache,
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struct strfilter *filter);
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struct probe_cache_entry *probe_cache__find(struct probe_cache *pcache,
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struct perf_probe_event *pev);
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struct probe_cache_entry *probe_cache__find_by_name(struct probe_cache *pcache,
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const char *group, const char *event);
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int probe_cache__show_all_caches(struct strfilter *filter);
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bool probe_type_is_available(enum probe_type type);
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bool kretprobe_offset_is_supported(void);
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bool uprobe_ref_ctr_is_supported(void);
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#else /* ! HAVE_LIBELF_SUPPORT */
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static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused, struct nsinfo *nsi __maybe_unused)
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{
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return NULL;
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}
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#define probe_cache__delete(pcache) do {} while (0)
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#endif
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#endif
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