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perf/core improvements and fixes:

Browse source 
User visible:
 
 - Add ability to specify to select which registers to record,
   to reduce the size of perf.data files, and also allow printing
   the registers in 'perf script': (Stephane Eranian)
 
     # perf record --intr-regs=AX,SP usleep 1
     [ perf record: Woken up 1 times to write data ]
     [ perf record: Captured and wrote 0.016 MB perf.data (8 samples) ]
     # perf script -F ip,sym,iregs | tail -5
      ffffffff8105f42a native_write_msr_safe   AX:0xf    SP:0xffff8802629c3c00
      ffffffff8105f42a native_write_msr_safe   AX:0xf    SP:0xffff8802629c3c00
      ffffffff81761ac0 _raw_spin_lock   AX:0xffff8801bfcf8020    SP:0xffff8802629c3ce8
      ffffffff81202bf8 __vma_adjust_trans_huge   AX:0x7ffc75200000    SP:0xffff8802629c3b30
      ffffffff8122b089 dput   AX:0x101    SP:0xffff8802629c3c78
     #
 
 Infrastructure:
 
 - Open event on evsel cpus and threads (Kan Liang)
 
 - New bpf API to get name from a BPF object (Wang Nan)
 
 Build fixes:
 
 - Fix build on powerpc broken by pt/bts (Adrian Hunter)
 
 Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

User visible changes:

  - Add ability to specify to select which registers to record,
    to reduce the size of perf.data files, and also allow printing
    the registers in 'perf script': (Stephane Eranian)

      # perf record --intr-regs=AX,SP usleep 1
      [ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.016 MB perf.data (8 samples) ]
      # perf script -F ip,sym,iregs | tail -5
       ffffffff8105f42a native_write_msr_safe   AX:0xf    SP:0xffff8802629c3c00
       ffffffff8105f42a native_write_msr_safe   AX:0xf    SP:0xffff8802629c3c00
       ffffffff81761ac0 _raw_spin_lock   AX:0xffff8801bfcf8020    SP:0xffff8802629c3ce8
       ffffffff81202bf8 __vma_adjust_trans_huge   AX:0x7ffc75200000    SP:0xffff8802629c3b30
       ffffffff8122b089 dput   AX:0x101    SP:0xffff8802629c3c78
      #

Infrastructure changes:

  - Open event on evsel cpus and threads. (Kan Liang)

  - Add new bpf API to get name from a BPF object. (Wang Nan)

Build fixes:

  - Fix build on powerpc broken by pt/bts. (Adrian Hunter)

Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Ingo Molnar 2015-09-01 10:24:54 +02:00
commit 5320266124
17 changed files with 193 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

25
tools/lib/bpf/libbpf.c
View file

@ -880,15 +880,26 @@ struct bpf_object *bpf_object__open(const char *path)
}
struct bpf_object *bpf_object__open_buffer(void *obj_buf,
size_t obj_buf_sz)
size_t obj_buf_sz,
const char *name)
{
char tmp_name[64];
/* param validation */
if (!obj_buf || obj_buf_sz <= 0)
return NULL;
pr_debug("loading object from buffer\n");
if (!name) {
snprintf(tmp_name, sizeof(tmp_name), "%lx-%lx",
(unsigned long)obj_buf,
(unsigned long)obj_buf_sz);
tmp_name[sizeof(tmp_name) - 1] = '\0';
name = tmp_name;
}
pr_debug("loading object '%s' from buffer\n",
name);
return __bpf_object__open("[buffer]", obj_buf, obj_buf_sz);
return __bpf_object__open(name, obj_buf, obj_buf_sz);
}
int bpf_object__unload(struct bpf_object *obj)
@ -975,6 +986,14 @@ bpf_object__next(struct bpf_object *prev)
return next;
}
const char *
bpf_object__get_name(struct bpf_object *obj)
{
if (!obj)
return NULL;
return obj->path;
}
struct bpf_program *
bpf_program__next(struct bpf_program *prev, struct bpf_object *obj)
{

4
tools/lib/bpf/libbpf.h
View file

@ -28,12 +28,14 @@ struct bpf_object;
struct bpf_object *bpf_object__open(const char *path);
struct bpf_object *bpf_object__open_buffer(void *obj_buf,
size_t obj_buf_sz);
size_t obj_buf_sz,
const char *name);
void bpf_object__close(struct bpf_object *object);
/* Load/unload object into/from kernel */
int bpf_object__load(struct bpf_object *obj);
int bpf_object__unload(struct bpf_object *obj);
const char *bpf_object__get_name(struct bpf_object *obj);
struct bpf_object *bpf_object__next(struct bpf_object *prev);
#define bpf_object__for_each_safe(pos, tmp) \