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perf_events: Undo some recursion damage

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Make perf_swevent_get_recursion_context return a context number
and disable preemption.

This could be used to remove the IRQ disable from the trace bit
and index the per-cpu buffer with.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091123103819.993226816@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-11-23 11:37:29 +01:00 • committed by Ingo Molnar
parent f67218c3e9
commit 4ed7c92d68
5 changed files with 61 additions and 63 deletions
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14
kernel/trace/trace_syscalls.c
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@ -481,8 +481,8 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
unsigned long flags;
char *trace_buf;
char *raw_data;
int *recursion;
int syscall_nr;
int rctx;
int size;
int cpu;
@ -506,7 +506,8 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
/* Protect the per cpu buffer, begin the rcu read side */
local_irq_save(flags);
if (perf_swevent_get_recursion_context(&recursion))
rctx = perf_swevent_get_recursion_context();
if (rctx < 0)
goto end_recursion;
cpu = smp_processor_id();
@ -530,7 +531,7 @@ static void prof_syscall_enter(struct pt_regs *regs, long id)
perf_tp_event(sys_data->enter_id, 0, 1, rec, size);
end:
perf_swevent_put_recursion_context(recursion);
perf_swevent_put_recursion_context(rctx);
end_recursion:
local_irq_restore(flags);
}
@ -582,7 +583,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
int syscall_nr;
char *trace_buf;
char *raw_data;
int *recursion;
int rctx;
int size;
int cpu;
@ -609,7 +610,8 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
/* Protect the per cpu buffer, begin the rcu read side */
local_irq_save(flags);
if (perf_swevent_get_recursion_context(&recursion))
rctx = perf_swevent_get_recursion_context();
if (rctx < 0)
goto end_recursion;
cpu = smp_processor_id();
@ -634,7 +636,7 @@ static void prof_syscall_exit(struct pt_regs *regs, long ret)
perf_tp_event(sys_data->exit_id, 0, 1, rec, size);
end:
perf_swevent_put_recursion_context(recursion);
perf_swevent_put_recursion_context(rctx);
end_recursion:
local_irq_restore(flags);
}