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perf: Reduce perf_disable() usage

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Since the current perf_disable() usage is only an optimization,
remove it for now. This eases the removal of the __weak
hw_perf_enable() interface.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus <paulus@samba.org>
Cc: stephane eranian <eranian@googlemail.com>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Lin Ming <ming.m.lin@intel.com>
Cc: Yanmin <yanmin_zhang@linux.intel.com>
Cc: Deng-Cheng Zhu <dengcheng.zhu@gmail.com>
Cc: David Miller <davem@davemloft.net>
Cc: Michael Cree <mcree@orcon.net.nz>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-06-11 17:32:03 +02:00 • committed by Ingo Molnar
parent 9ed6060d28
commit 24cd7f54a0
8 changed files with 48 additions and 59 deletions
Download patch file Download diff file Expand all files Collapse all files

11
arch/sh/kernel/perf_event.c
View file

@ -230,11 +230,14 @@ static int sh_pmu_enable(struct perf_event *event)
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
struct hw_perf_event *hwc = &event->hw;
int idx = hwc->idx;
int ret = -EAGAIN;
perf_disable();
if (test_and_set_bit(idx, cpuc->used_mask)) {
idx = find_first_zero_bit(cpuc->used_mask, sh_pmu->num_events);
if (idx == sh_pmu->num_events)
return -EAGAIN;
goto out;
set_bit(idx, cpuc->used_mask);
hwc->idx = idx;
@ -248,8 +251,10 @@ static int sh_pmu_enable(struct perf_event *event)
sh_pmu->enable(hwc, idx);
perf_event_update_userpage(event);
return 0;
ret = 0;
out:
perf_enable();
return ret;
}
static void sh_pmu_read(struct perf_event *event)