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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-01-22 16:40:12 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-01-29 09:01:42 +0100 |
| commit | c933c1a603d5bf700ddce79216c1be0ec3bc0e6c (patch) | |
| tree | 3bac24921bf5ef9bcf2db6f6e8bfa5a7a0b6c3a9 /arch/x86 | |
| parent | 272d30be622c9c6cbd514b1211ff359292001baa (diff) | |
| download | blackbird-op-linux-c933c1a603d5bf700ddce79216c1be0ec3bc0e6c.tar.gz blackbird-op-linux-c933c1a603d5bf700ddce79216c1be0ec3bc0e6c.zip | |
perf_event: x86: Optimize the fast path a little more
Remove num from the fast path and save a few ops.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <20100122155536.056430539@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 2c22ce4fa784..33c889ff21ae 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1245,9 +1245,9 @@ static inline int is_x86_event(struct perf_event *event) static int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) { - int i, j, w, num, wmax; struct event_constraint *c, *constraints[X86_PMC_IDX_MAX]; unsigned long used_mask[BITS_TO_LONGS(X86_PMC_IDX_MAX)]; + int i, j, w, wmax, num = 0; struct hw_perf_event *hwc; bitmap_zero(used_mask, X86_PMC_IDX_MAX); @@ -1260,7 +1260,7 @@ static int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) /* * fastpath, try to reuse previous register */ - for (i = 0, num = n; i < n; i++, num--) { + for (i = 0; i < n; i++) { hwc = &cpuc->event_list[i]->hw; c = constraints[i]; @@ -1288,7 +1288,7 @@ static int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign) if (assign) assign[i] = hwc->idx; } - if (!num) + if (i == n) goto done; /* |
