Messages in this thread Patch in this message | | | From | David Carrillo-Cisneros <> | Subject | [PATCH 30/32] perf,perf/x86: add hook perf_event_arch_exec | Date | Thu, 28 Apr 2016 21:43:36 -0700 |
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perf_event context switches events to newly exec'ed tasks using perf_event_exec. Add a hook for such path.
In x86, perf_event_arch_exec is used to synchronize the software cache of the PQR_ASSOC msr, setting the right RMID for the new task.
Reviewed-by: Stephane Eranian <eranian@google.com> Signed-off-by: David Carrillo-Cisneros <davidcc@google.com> --- arch/x86/include/asm/perf_event.h | 2 ++ include/linux/perf_event.h | 5 +++++ kernel/events/core.c | 1 + 3 files changed, 8 insertions(+)
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 99fc206..c13f501 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -332,6 +332,8 @@ extern struct cftype perf_event_cgrp_arch_subsys_cftypes[]; .dfl_cftypes = perf_event_cgrp_arch_subsys_cftypes, \ .legacy_cftypes = perf_event_cgrp_arch_subsys_cftypes, +#define perf_event_arch_exec pqr_update + #else #define PERF_CGROUP_ARCH_CGRP_SUBSYS_ATTS diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 9c973bd..99b4393 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -1289,4 +1289,9 @@ static struct device_attribute format_attr_##_name = __ATTR_RO(_name) #define PERF_CGROUP_ARCH_CGRP_SUBSYS_ATTS #endif +#ifndef perf_event_arch_exec +#define perf_event_arch_exec() do { } while (0) +#endif + + #endif /* _LINUX_PERF_EVENT_H */ diff --git a/kernel/events/core.c b/kernel/events/core.c index cfffa50..5c675b4 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3248,6 +3248,7 @@ void perf_event_exec(void) for_each_task_context_nr(ctxn) perf_event_enable_on_exec(ctxn); rcu_read_unlock(); + perf_event_arch_exec(); } struct perf_read_data { -- 2.8.0.rc3.226.g39d4020
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