diff options
| author | David S. Miller <davem@davemloft.net> | 2010-04-11 02:44:30 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-04-11 02:44:30 -0700 |
| commit | 4a1032faac94ebbf647460ae3e06fc21146eb280 (patch) | |
| tree | 7f31b97beb0406faa1523e619289ad0ab07c9787 /kernel/perf_event.c | |
| parent | ae4e8d63b5619d4d95f1d2bfa2b836caa6e62d06 (diff) | |
| parent | 0eddb519b9127c73d53db4bf3ec1d45b13f844d1 (diff) | |
| download | op-kernel-dev-4a1032faac94ebbf647460ae3e06fc21146eb280.zip op-kernel-dev-4a1032faac94ebbf647460ae3e06fc21146eb280.tar.gz | |
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 23 |
1 files changed, 15 insertions, 8 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 574ee58..2f3fbf8 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -15,6 +15,7 @@ #include <linux/smp.h> #include <linux/file.h> #include <linux/poll.h> +#include <linux/slab.h> #include <linux/sysfs.h> #include <linux/dcache.h> #include <linux/percpu.h> @@ -1164,11 +1165,9 @@ void perf_event_task_sched_out(struct task_struct *task, struct perf_event_context *ctx = task->perf_event_ctxp; struct perf_event_context *next_ctx; struct perf_event_context *parent; - struct pt_regs *regs; int do_switch = 1; - regs = task_pt_regs(task); - perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, regs, 0); + perf_sw_event(PERF_COUNT_SW_CONTEXT_SWITCHES, 1, 1, NULL, 0); if (likely(!ctx || !cpuctx->task_ctx)) return; @@ -2786,12 +2785,11 @@ __weak struct perf_callchain_entry *perf_callchain(struct pt_regs *regs) return NULL; } -#ifdef CONFIG_EVENT_TRACING __weak void perf_arch_fetch_caller_regs(struct pt_regs *regs, unsigned long ip, int skip) { } -#endif + /* * Output @@ -3378,15 +3376,23 @@ static void perf_event_task_output(struct perf_event *event, struct perf_task_event *task_event) { struct perf_output_handle handle; - int size; struct task_struct *task = task_event->task; - int ret; + unsigned long flags; + int size, ret; + + /* + * If this CPU attempts to acquire an rq lock held by a CPU spinning + * in perf_output_lock() from interrupt context, it's game over. + */ + local_irq_save(flags); size = task_event->event_id.header.size; ret = perf_output_begin(&handle, event, size, 0, 0); - if (ret) + if (ret) { + local_irq_restore(flags); return; + } task_event->event_id.pid = perf_event_pid(event, task); task_event->event_id.ppid = perf_event_pid(event, current); @@ -3397,6 +3403,7 @@ static void perf_event_task_output(struct perf_event *event, perf_output_put(&handle, task_event->event_id); perf_output_end(&handle); + local_irq_restore(flags); } static int perf_event_task_match(struct perf_event *event) |
