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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-10 23:08:32 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-17 04:11:51 +0200 |
| commit | 3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0 (patch) | |
| tree | 894e513ec904c0b4249917b64adac9d5bda162b5 /arch/mips | |
| parent | perf core: Pass max stack as a perf_callchain_entry context (diff) | |
| download | linux-3b1fff08038bd0792b1aa1e9703b2dd0512a3fd0.tar.xz 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/mips')
| -rw-r--r-- | arch/mips/kernel/perf_event.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/mips/kernel/perf_event.c b/arch/mips/kernel/perf_event.c index 22395c7d7030..d64056e0bb56 100644 --- a/arch/mips/kernel/perf_event.c +++ b/arch/mips/kernel/perf_event.c @@ -35,7 +35,7 @@ static void save_raw_perf_callchain(struct perf_callchain_entry_ctx *entry, addr = *sp++; if (__kernel_text_address(addr)) { perf_callchain_store(entry, addr); - if (entry->entry->nr >= entry->max_stack) + if (entry->nr >= entry->max_stack) break; } } @@ -59,7 +59,7 @@ void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, } do { perf_callchain_store(entry, pc); - if (entry->entry->nr >= entry->max_stack) + if (entry->nr >= entry->max_stack) break; pc = unwind_stack(current, &sp, pc, &ra); } while (pc); |