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Subject[tip:perf/core] perf/x86: Add Haswell specific transaction flag reporting
Commit-ID:  a405bad5ad2086766ce320b16a56952e013327f8
Gitweb: http://git.kernel.org/tip/a405bad5ad2086766ce320b16a56952e013327f8
Author: Andi Kleen <ak@linux.intel.com>
AuthorDate: Fri, 20 Sep 2013 07:40:40 -0700
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Fri, 4 Oct 2013 10:06:09 +0200

perf/x86: Add Haswell specific transaction flag reporting

In the PEBS handler report the transaction flags using the new
generic transaction flags facility. Most of them come from
the "tsx_tuning" field in PEBSv2, but the abort code is derived
from the RAX register reported in the PEBS record.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1379688044-14173-3-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/cpu/perf_event_intel_ds.c | 24 ++++++++++++++++++++----
1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
index 07d9a05..32e9ed8 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
@@ -206,6 +206,8 @@ union hsw_tsx_tuning {
u64 value;
};

+#define PEBS_HSW_TSX_FLAGS 0xff00000000ULL
+
void init_debug_store_on_cpu(int cpu)
{
struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
@@ -807,6 +809,16 @@ static inline u64 intel_hsw_weight(struct pebs_record_hsw *pebs)
return 0;
}

+static inline u64 intel_hsw_transaction(struct pebs_record_hsw *pebs)
+{
+ u64 txn = (pebs->tsx_tuning & PEBS_HSW_TSX_FLAGS) >> 32;
+
+ /* For RTM XABORTs also log the abort code from AX */
+ if ((txn & PERF_TXN_TRANSACTION) && (pebs->ax & 1))
+ txn |= ((pebs->ax >> 24) & 0xff) << PERF_TXN_ABORT_SHIFT;
+ return txn;
+}
+
static void __intel_pmu_pebs_event(struct perf_event *event,
struct pt_regs *iregs, void *__pebs)
{
@@ -885,10 +897,14 @@ static void __intel_pmu_pebs_event(struct perf_event *event,
x86_pmu.intel_cap.pebs_format >= 1)
data.addr = pebs->dla;

- /* Only set the TSX weight when no memory weight was requested. */
- if ((event->attr.sample_type & PERF_SAMPLE_WEIGHT) && !fll &&
- (x86_pmu.intel_cap.pebs_format >= 2))
- data.weight = intel_hsw_weight(pebs);
+ if (x86_pmu.intel_cap.pebs_format >= 2) {
+ /* Only set the TSX weight when no memory weight. */
+ if ((event->attr.sample_type & PERF_SAMPLE_WEIGHT) && !fll)
+ data.weight = intel_hsw_weight(pebs);
+
+ if (event->attr.sample_type & PERF_SAMPLE_TRANSACTION)
+ data.txn = intel_hsw_transaction(pebs);
+ }

if (has_branch_stack(event))
data.br_stack = &cpuc->lbr_stack;

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