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Message-Id: <1351058350-9159-2-git-send-email-zheng.z.yan@intel.com>
Date: Wed, 24 Oct 2012 13:59:04 +0800
From: "Yan, Zheng" <zheng.z.yan@...el.com>
To: linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl
Cc: eranian@...gle.com, ak@...ux.intel.com,
"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: [PATCH V2 1/7] perf, x86: Reduce lbr_sel_map size
From: "Yan, Zheng" <zheng.z.yan@...el.com>
The index of lbr_sel_map is bit value of perf branch_sample_type.
By using bit shift as index, we can reduce lbr_sel_map size.
Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com>
---
arch/x86/kernel/cpu/perf_event.h | 4 +++
arch/x86/kernel/cpu/perf_event_intel_lbr.c | 50 ++++++++++++++----------------
include/uapi/linux/perf_event.h | 42 +++++++++++++++++--------
3 files changed, 56 insertions(+), 40 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index d3b3bb7..ea6749a 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -412,6 +412,10 @@ struct x86_pmu {
struct perf_guest_switch_msr *(*guest_get_msrs)(int *nr);
};
+enum {
+ PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE = PERF_SAMPLE_BRANCH_MAX_SHIFT,
+};
+
#define x86_add_quirk(func_) \
do { \
static struct x86_pmu_quirk __quirk __initdata = { \
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 31fe046..7d9ae5f 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -61,10 +61,6 @@ enum {
#define LBR_FROM_FLAG_INTX (1ULL << 62)
#define LBR_FROM_FLAG_ABORT (1ULL << 61)
-#define for_each_branch_sample_type(x) \
- for ((x) = PERF_SAMPLE_BRANCH_USER; \
- (x) < PERF_SAMPLE_BRANCH_MAX; (x) <<= 1)
-
/*
* x86control flow change classification
* x86control flow changes include branches, interrupts, traps, faults
@@ -378,14 +374,14 @@ static int intel_pmu_setup_hw_lbr_filter(struct perf_event *event)
{
struct hw_perf_event_extra *reg;
u64 br_type = event->attr.branch_sample_type;
- u64 mask = 0, m;
- u64 v;
+ u64 mask = 0, v;
+ int i;
- for_each_branch_sample_type(m) {
- if (!(br_type & m))
+ for (i = 0; i < PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE; i++) {
+ if (!(br_type & (1U << i)))
continue;
- v = x86_pmu.lbr_sel_map[m];
+ v = x86_pmu.lbr_sel_map[i];
if (v == LBR_NOT_SUPP)
return -EOPNOTSUPP;
@@ -631,33 +627,33 @@ intel_pmu_lbr_filter(struct cpu_hw_events *cpuc)
/*
* Map interface branch filters onto LBR filters
*/
-static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = {
- [PERF_SAMPLE_BRANCH_ANY] = LBR_ANY,
- [PERF_SAMPLE_BRANCH_USER] = LBR_USER,
- [PERF_SAMPLE_BRANCH_KERNEL] = LBR_KERNEL,
- [PERF_SAMPLE_BRANCH_HV] = LBR_IGN,
- [PERF_SAMPLE_BRANCH_ANY_RETURN] = LBR_RETURN | LBR_REL_JMP
- | LBR_IND_JMP | LBR_FAR,
+static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
+ [PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY,
+ [PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER,
+ [PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL,
+ [PERF_SAMPLE_BRANCH_HV_SHIFT] = LBR_IGN,
+ [PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT] = LBR_RETURN | LBR_REL_JMP
+ | LBR_IND_JMP | LBR_FAR,
/*
* NHM/WSM erratum: must include REL_JMP+IND_JMP to get CALL branches
*/
- [PERF_SAMPLE_BRANCH_ANY_CALL] =
+ [PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT] =
LBR_REL_CALL | LBR_IND_CALL | LBR_REL_JMP | LBR_IND_JMP | LBR_FAR,
/*
* NHM/WSM erratum: must include IND_JMP to capture IND_CALL
*/
- [PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL | LBR_IND_JMP,
+ [PERF_SAMPLE_BRANCH_IND_CALL_SHIFT] = LBR_IND_CALL | LBR_IND_JMP,
};
-static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = {
- [PERF_SAMPLE_BRANCH_ANY] = LBR_ANY,
- [PERF_SAMPLE_BRANCH_USER] = LBR_USER,
- [PERF_SAMPLE_BRANCH_KERNEL] = LBR_KERNEL,
- [PERF_SAMPLE_BRANCH_HV] = LBR_IGN,
- [PERF_SAMPLE_BRANCH_ANY_RETURN] = LBR_RETURN | LBR_FAR,
- [PERF_SAMPLE_BRANCH_ANY_CALL] = LBR_REL_CALL | LBR_IND_CALL
- | LBR_FAR,
- [PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL,
+static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_SELECT_MAP_SIZE] = {
+ [PERF_SAMPLE_BRANCH_ANY_SHIFT] = LBR_ANY,
+ [PERF_SAMPLE_BRANCH_USER_SHIFT] = LBR_USER,
+ [PERF_SAMPLE_BRANCH_KERNEL_SHIFT] = LBR_KERNEL,
+ [PERF_SAMPLE_BRANCH_HV_SHIFT] = LBR_IGN,
+ [PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT] = LBR_RETURN | LBR_FAR,
+ [PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT] = LBR_REL_CALL | LBR_IND_CALL
+ | LBR_FAR,
+ [PERF_SAMPLE_BRANCH_IND_CALL_SHIFT] = LBR_IND_CALL,
};
/* core */
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index d1ffdb6..4a735be 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -148,20 +148,36 @@ enum perf_event_sample_format {
* The branch types can be combined, however BRANCH_ANY covers all types
* of branches and therefore it supersedes all the other types.
*/
+enum perf_branch_sample_type_shift {
+ PERF_SAMPLE_BRANCH_USER_SHIFT = 0, /* user branches */
+ PERF_SAMPLE_BRANCH_KERNEL_SHIFT = 1, /* kernel branches */
+ PERF_SAMPLE_BRANCH_HV_SHIFT = 2, /* hypervisor branches */
+
+ PERF_SAMPLE_BRANCH_ANY_SHIFT = 3, /* any branch types */
+ PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT = 4, /* any call branch */
+ PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT = 5, /* any return branch */
+ PERF_SAMPLE_BRANCH_IND_CALL_SHIFT = 6, /* indirect calls */
+ PERF_SAMPLE_BRANCH_ABORT_SHIFT = 7, /* transaction aborts */
+ PERF_SAMPLE_BRANCH_INTX_SHIFT = 8, /* in transaction */
+ PERF_SAMPLE_BRANCH_NOTX_SHIFT = 9, /* not in transaction */
+
+ PERF_SAMPLE_BRANCH_MAX_SHIFT, /* non-ABI */
+};
+
enum perf_branch_sample_type {
- PERF_SAMPLE_BRANCH_USER = 1U << 0, /* user branches */
- PERF_SAMPLE_BRANCH_KERNEL = 1U << 1, /* kernel branches */
- PERF_SAMPLE_BRANCH_HV = 1U << 2, /* hypervisor branches */
-
- PERF_SAMPLE_BRANCH_ANY = 1U << 3, /* any branch types */
- PERF_SAMPLE_BRANCH_ANY_CALL = 1U << 4, /* any call branch */
- PERF_SAMPLE_BRANCH_ANY_RETURN = 1U << 5, /* any return branch */
- PERF_SAMPLE_BRANCH_IND_CALL = 1U << 6, /* indirect calls */
- PERF_SAMPLE_BRANCH_ABORT = 1U << 7, /* transaction aborts */
- PERF_SAMPLE_BRANCH_INTX = 1U << 8, /* in transaction (flag) */
- PERF_SAMPLE_BRANCH_NOTX = 1U << 9, /* not in transaction (flag) */
-
- PERF_SAMPLE_BRANCH_MAX = 1U << 10, /* non-ABI */
+ PERF_SAMPLE_BRANCH_USER = 1U << PERF_SAMPLE_BRANCH_USER_SHIFT,
+ PERF_SAMPLE_BRANCH_KERNEL = 1U << PERF_SAMPLE_BRANCH_KERNEL_SHIFT,
+ PERF_SAMPLE_BRANCH_HV = 1U << PERF_SAMPLE_BRANCH_HV_SHIFT,
+
+ PERF_SAMPLE_BRANCH_ANY = 1U << PERF_SAMPLE_BRANCH_ANY_SHIFT,
+ PERF_SAMPLE_BRANCH_ANY_CALL = 1U << PERF_SAMPLE_BRANCH_ANY_CALL_SHIFT,
+ PERF_SAMPLE_BRANCH_ANY_RETURN = 1U << PERF_SAMPLE_BRANCH_ANY_RETURN_SHIFT,
+ PERF_SAMPLE_BRANCH_IND_CALL = 1U << PERF_SAMPLE_BRANCH_IND_CALL_SHIFT,
+ PERF_SAMPLE_BRANCH_ABORT = 1U << PERF_SAMPLE_BRANCH_ABORT_SHIFT,
+ PERF_SAMPLE_BRANCH_INTX = 1U << PERF_SAMPLE_BRANCH_INTX_SHIFT,
+ PERF_SAMPLE_BRANCH_NOTX = 1U << PERF_SAMPLE_BRANCH_NOTX_SHIFT,
+
+ PERF_SAMPLE_BRANCH_MAX = 1U << PERF_SAMPLE_BRANCH_MAX_SHIFT,
};
#define PERF_SAMPLE_BRANCH_PLM_ALL \
--
1.7.11.7
--
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