path: root/arch/s390
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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/s390
parent88a486132dffeb010d659e00361c4d114de09972 (diff)
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/s390')
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index 19138be412d6..cb774ff6e749 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -536,7 +536,7 @@ static int cpumf_pmu_add(struct perf_event *event, int flags)
* For group events transaction, the authorization check is
* done in cpumf_pmu_commit_txn().
- if (!(cpuhw->flags & PERF_EVENT_TXN))
+ if (!(cpuhw->txn_flags & PERF_PMU_TXN_ADD))
if (validate_ctr_auth(&event->hw))
return -EPERM;
@@ -590,7 +590,6 @@ static void cpumf_pmu_start_txn(struct pmu *pmu, unsigned int txn_flags)
- cpuhw->flags |= PERF_EVENT_TXN;
cpuhw->tx_state = cpuhw->state;
@@ -613,7 +612,6 @@ static void cpumf_pmu_cancel_txn(struct pmu *pmu)
WARN_ON(cpuhw->tx_state != cpuhw->state);
- cpuhw->flags &= ~PERF_EVENT_TXN;
@@ -640,7 +638,6 @@ static int cpumf_pmu_commit_txn(struct pmu *pmu)
if ((state & cpuhw->info.auth_ctl) != state)
return -EPERM;
- cpuhw->flags &= ~PERF_EVENT_TXN;
cpuhw->txn_flags = 0;
return 0;