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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-10 18:08:32 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-16 23:11:51 -0300 |
| commit | 3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0 (patch) | |
| tree | 894e513ec904c0b4249917b64adac9d5bda162b5 /arch/x86 | |
| parent | cfbcf468454ab4b20f0b4b62da51920b99fdb19e (diff) | |
| download | linux-3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0.tar.gz linux-3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0.tar.bz2 linux-3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0.zip | |
perf core: Add a 'nr' field to perf_event_callchain_context
We will use it to count how many addresses are in the entry->ip[] array,
excluding PERF_CONTEXT_{KERNEL,USER,etc} entries, so that we can really
return the number of entries specified by the user via the relevant
sysctl, kernel.perf_event_max_contexts, or via the per event
perf_event_attr.sample_max_stack knob.
This way we keep the perf_sample->ip_callchain->nr meaning, that is the
number of entries, be it real addresses or PERF_CONTEXT_ entries, while
honouring the max_stack knobs, i.e. the end result will be max_stack
entries if we have at least that many entries in a given stack trace.
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-s8teto51tdqvlfhefndtat9r@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/events/core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 07f2b01cfb72..5de96a18cd9c 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2283,7 +2283,7 @@ perf_callchain_user32(struct pt_regs *regs, struct perf_callchain_entry_ctx *ent fp = compat_ptr(ss_base + regs->bp); pagefault_disable(); - while (entry->entry->nr < entry->max_stack) { + while (entry->nr < entry->max_stack) { unsigned long bytes; frame.next_frame = 0; frame.return_address = 0; @@ -2343,7 +2343,7 @@ perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs return; pagefault_disable(); - while (entry->entry->nr < entry->max_stack) { + while (entry->nr < entry->max_stack) { unsigned long bytes; frame.next_frame = NULL; frame.return_address = 0; |