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authorSukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>2015-09-03 20:07:53 -0700
committerIngo Molnar <mingo@kernel.org>2015-09-13 11:27:30 +0200
commit8f3e5684d3fbd91ead283916676fa3dac22615e5 (patch)
treee59407b8578f7dc67e25c9acc6f4633d3b45bedf /arch/sparc
parent88a486132dffeb010d659e00361c4d114de09972 (diff)
downloadlinux-8f3e5684d3fbd91ead283916676fa3dac22615e5.tar.bz2
perf/core: Drop PERF_EVENT_TXN
We currently use PERF_EVENT_TXN flag to determine if we are in the middle of a transaction. If in a transaction, we defer the schedulability checks from pmu->add() operation to the pmu->commit() operation. Now that we have "transaction types" (PERF_PMU_TXN_ADD, PERF_PMU_TXN_READ) we can use the type to determine if we are in a transaction and drop the PERF_EVENT_TXN flag. When PERF_EVENT_TXN is dropped, the cpuhw->group_flag on some architectures becomes unused, so drop that field as well. This is an extension of the Powerpc patch from Peter Zijlstra to s390, Sparc and x86 architectures. Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Link: http://lkml.kernel.org/r/1441336073-22750-11-git-send-email-sukadev@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/kernel/perf_event.c6
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 2c0984d146ec..b0da5aedb336 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -108,7 +108,6 @@ struct cpu_hw_events {
/* Enabled/disable state. */
int enabled;
- unsigned int group_flag;
unsigned int txn_flags;
};
static DEFINE_PER_CPU(struct cpu_hw_events, cpu_hw_events) = { .enabled = 1, };
@@ -1380,7 +1379,7 @@ static int sparc_pmu_add(struct perf_event *event, int ef_flags)
* skip the schedulability test here, it will be performed
* at commit time(->commit_txn) as a whole
*/
- if (cpuc->group_flag & PERF_EVENT_TXN)
+ if (cpuc->txn_flags & PERF_PMU_TXN_ADD)
goto nocheck;
if (check_excludes(cpuc->event, n0, 1))
@@ -1506,7 +1505,6 @@ static void sparc_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags)
return;
perf_pmu_disable(pmu);
- cpuhw->group_flag |= PERF_EVENT_TXN;
}
/*
@@ -1526,7 +1524,6 @@ static void sparc_pmu_cancel_txn(struct pmu *pmu)
if (txn_flags & ~PERF_PMU_TXN_ADD)
return;
- cpuhw->group_flag &= ~PERF_EVENT_TXN;
perf_pmu_enable(pmu);
}
@@ -1556,7 +1553,6 @@ static int sparc_pmu_commit_txn(struct pmu *pmu)
if (sparc_check_constraints(cpuc->event, cpuc->events, n))
return -EAGAIN;
- cpuc->group_flag &= ~PERF_EVENT_TXN;
cpuc->txn_flags = 0;
perf_pmu_enable(pmu);
return 0;