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authorFrederic Weisbecker <fweisbec@gmail.com>2010-02-28 22:51:15 +0300
committerFrederic Weisbecker <fweisbec@gmail.com>2010-02-28 22:51:15 +0300
commit1e259e0a9982078896f3404240096cbea01daca4 (patch)
treec298759ae0957b014788f8c79197c90928e69623 /kernel/hw_breakpoint.c
parent388c3aab5d4f1b0bbfe2d5f47e7cd681866bc573 (diff)
downloadlinux-1e259e0a9982078896f3404240096cbea01daca4.tar.xz
hw-breakpoints: Remove stub unthrottle callback
We support event unthrottling in breakpoint events. It means that if we have more than sysctl_perf_event_sample_rate/HZ, perf will throttle, ignoring subsequent events until the next tick. So if ptrace exceeds this max rate, it will omit events, which breaks the ptrace determinism that is supposed to report every triggered breakpoints. This is likely to happen if we set sysctl_perf_event_sample_rate to 1. This patch removes support for unthrottling in breakpoint events to break throttling and restore ptrace determinism. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: 2.6.33.x <stable@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'kernel/hw_breakpoint.c')
-rw-r--r--kernel/hw_breakpoint.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/kernel/hw_breakpoint.c b/kernel/hw_breakpoint.c
index 967e66143e11..4d99512ee149 100644
--- a/kernel/hw_breakpoint.c
+++ b/kernel/hw_breakpoint.c
@@ -489,5 +489,4 @@ struct pmu perf_ops_bp = {
.enable = arch_install_hw_breakpoint,
.disable = arch_uninstall_hw_breakpoint,
.read = hw_breakpoint_pmu_read,
- .unthrottle = hw_breakpoint_pmu_unthrottle
};