diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-03-30 19:07:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-06 09:30:36 +0200 |
| commit | 925d519ab82b6dd7aca9420d809ee83819c08db2 (patch) | |
| tree | aa05bd7eb607915aa691d5434ec74521b487b466 /arch/x86/include/asm/perf_counter.h | |
| parent | 53cfbf593758916aac41db728f029986a62f1254 (diff) | |
perf_counter: unify and fix delayed counter wakeup
While going over the wakeup code I noticed delayed wakeups only work
for hardware counters but basically all software counters rely on
them.
This patch unifies and generalizes the delayed wakeup to fix this
issue.
Since we're dealing with NMI context bits here, use a cmpxchg() based
single link list implementation to track counters that have pending
wakeups.
[ This should really be generic code for delayed wakeups, but since we
cannot use cmpxchg()/xchg() in generic code, I've let it live in the
perf_counter code. -- Eric Dumazet could use it to aggregate the
network wakeups. ]
Furthermore, the x86 method of using TIF flags was flawed in that its
quite possible to end up setting the bit on the idle task, loosing the
wakeup.
The powerpc method uses per-cpu storage and does appear to be
sufficient.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090330171023.153932974@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/include/asm/perf_counter.h')
| -rw-r--r-- | arch/x86/include/asm/perf_counter.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/include/asm/perf_counter.h b/arch/x86/include/asm/perf_counter.h index 1662043b340..e2b0e66b235 100644 --- a/arch/x86/include/asm/perf_counter.h +++ b/arch/x86/include/asm/perf_counter.h @@ -84,8 +84,9 @@ union cpuid10_edx { #define MSR_ARCH_PERFMON_FIXED_CTR2 0x30b #define X86_PMC_IDX_FIXED_BUS_CYCLES (X86_PMC_IDX_FIXED + 2) -#define set_perf_counter_pending() \ - set_tsk_thread_flag(current, TIF_PERF_COUNTERS); +#define set_perf_counter_pending() do { } while (0) +#define clear_perf_counter_pending() do { } while (0) +#define test_perf_counter_pending() (0) #ifdef CONFIG_PERF_COUNTERS extern void init_hw_perf_counters(void); |