Messages in this thread - First message in thread
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- Stephane Eranian
- Stephane Eranian
| | | Date | Wed, 5 Feb 2014 18:26:55 +0100 | Subject | Re: [PATCH 08/14] perf, x86: allocate space for storing LBR stack | From | Stephane Eranian <> |
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On Fri, Jan 3, 2014 at 6:48 AM, Yan, Zheng <zheng.z.yan@intel.com> wrote: > When the LBR call stack is enabled, it is necessary to save/restore > the LBR stack on context switch. We can use pmu specific data to > store LBR stack when task is scheduled out. This patch adds code > that allocates the pmu specific data. > Reviewed-by: Stephane Eranian <eranian@google.com> > Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> > --- > arch/x86/kernel/cpu/perf_event.c | 1 + > arch/x86/kernel/cpu/perf_event.h | 7 +++++++ > 2 files changed, 8 insertions(+) > > diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c > index 69e2095..2e43f1b 100644 > --- a/arch/x86/kernel/cpu/perf_event.c > +++ b/arch/x86/kernel/cpu/perf_event.c > @@ -1879,6 +1879,7 @@ static struct pmu pmu = { > > .event_idx = x86_pmu_event_idx, > .sched_task = x86_pmu_sched_task, > + .task_ctx_size = sizeof(struct x86_perf_task_context), > }; > > void arch_perf_update_userpage(struct perf_event_mmap_page *userpg, u64 now) > diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h > index 3ef4b79..3ed9629 100644 > --- a/arch/x86/kernel/cpu/perf_event.h > +++ b/arch/x86/kernel/cpu/perf_event.h > @@ -459,6 +459,13 @@ struct x86_pmu { > struct perf_guest_switch_msr *(*guest_get_msrs)(int *nr); > }; > > +struct x86_perf_task_context { > + u64 lbr_from[MAX_LBR_ENTRIES]; > + u64 lbr_to[MAX_LBR_ENTRIES]; > + int lbr_callstack_users; > + int lbr_stack_state; > +}; > + > enum { > PERF_SAMPLE_BRANCH_CALL_STACK_SHIFT = PERF_SAMPLE_BRANCH_MAX_SHIFT, > PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE, > -- > 1.8.4.2 >
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