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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-06-18 11:40:28 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-18 14:46:11 +0200 |
| commit | 9d91a6f7a489eb914c16b82d927f9d81d629c259 (patch) | |
| tree | efdccca4b54282bcc941fce5206778d6b0f8e49d /tools/perf/builtin-report.c | |
| parent | perf_counter: Add event overlow handling (diff) | |
| download | linux-9d91a6f7a489eb914c16b82d927f9d81d629c259.tar.xz linux-9d91a6f7a489eb914c16b82d927f9d81d629c259.zip | |
perf_counter tools: Handle lost events
Make use of the new ->data_tail mechanism to tell kernel-space
about user-space draining the data stream. Emit lost events
(and display them) if they happen.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-report.c')
| -rw-r--r-- | tools/perf/builtin-report.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c index 9a3805f0c9f2..fe66895111b1 100644 --- a/tools/perf/builtin-report.c +++ b/tools/perf/builtin-report.c @@ -83,6 +83,12 @@ struct period_event { __u64 sample_period; }; +struct lost_event { + struct perf_event_header header; + __u64 id; + __u64 lost; +}; + typedef union event_union { struct perf_event_header header; struct ip_event ip; @@ -90,6 +96,7 @@ typedef union event_union { struct comm_event comm; struct fork_event fork; struct period_event period; + struct lost_event lost; } event_t; static LIST_HEAD(dsos); @@ -1068,7 +1075,8 @@ static unsigned long total = 0, total_mmap = 0, total_comm = 0, total_fork = 0, - total_unknown = 0; + total_unknown = 0, + total_lost = 0; static int validate_chain(struct perf_callchain_entry *chain, event_t *event) { @@ -1260,6 +1268,20 @@ process_period_event(event_t *event, unsigned long offset, unsigned long head) return 0; } +static int +process_lost_event(event_t *event, unsigned long offset, unsigned long head) +{ + dprintf("%p [%p]: PERF_EVENT_LOST: id:%Ld: lost:%Ld\n", + (void *)(offset + head), + (void *)(long)(event->header.size), + event->lost.id, + event->lost.lost); + + total_lost += event->lost.lost; + + return 0; +} + static void trace_event(event_t *event) { unsigned char *raw_event = (void *)event; @@ -1316,6 +1338,10 @@ process_event(event_t *event, unsigned long offset, unsigned long head) case PERF_EVENT_PERIOD: return process_period_event(event, offset, head); + + case PERF_EVENT_LOST: + return process_lost_event(event, offset, head); + /* * We dont process them right now but they are fine: */ @@ -1444,6 +1470,7 @@ more: dprintf(" mmap events: %10ld\n", total_mmap); dprintf(" comm events: %10ld\n", total_comm); dprintf(" fork events: %10ld\n", total_fork); + dprintf(" lost events: %10ld\n", total_lost); dprintf(" unknown events: %10ld\n", total_unknown); if (dump_trace) |