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- "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"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Yan, Zheng"
- "Liang, Kan"
| | | Date | Mon, 07 Jul 2014 14:36:52 +0800 | From | "Yan, Zheng" <> | Subject | Re: [PATCH V4 08/16] perf, x86: allocate space for storing LBR stack |
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please ignore this patch
On 07/07/2014 02:28 PM, Yan, Zheng 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. > > Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> > Reviewed-by: Stephane Eranian <eranian@google.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 8868e9b..2008c2a 100644 > --- a/arch/x86/kernel/cpu/perf_event.c > +++ b/arch/x86/kernel/cpu/perf_event.c > @@ -1907,6 +1907,7 @@ 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 cc25819..b0eabca 100644 > --- a/arch/x86/kernel/cpu/perf_event.h > +++ b/arch/x86/kernel/cpu/perf_event.h > @@ -472,6 +472,13 @@ 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, >
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