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Subject[PATCH 08/15] perf, x86: Allocate memory for saving LBR stack
Date
From: "Yan, Zheng" <zheng.z.yan@intel.com>

Allocate memory for perf task context, use the memory to save
LBR stack.

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,
--
1.8.1.4


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