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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-03 12:40:46 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-03 12:40:46 -0700
commit7447d56217e215e50317f308aee1ed293ac4f749 (patch)
tree903832ecb206ae83160992c6aec40c624821941f /kernel/events
parent892ad5acca0b2ddb514fae63fa4686bf726d2471 (diff)
parent23acd3e1a0a377cf3730ccb753aa1fdc50378396 (diff)
downloadlinux-7447d56217e215e50317f308aee1ed293ac4f749.tar.bz2
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf updates from Ingo Molnar: "Most of the changes are for tooling, the main changes in this cycle were: - Improve Intel-PT hardware tracing support, both on the kernel and on the tooling side: PTWRITE instruction support, power events for C-state tracing, etc. (Adrian Hunter) - Add support to measure SMI cost to the x86 architecture, with tooling support in 'perf stat' (Kan Liang) - Support function filtering in 'perf ftrace', plus related improvements (Namhyung Kim) - Allow adding and removing fields to the default 'perf script' columns, using + or - as field prefixes to do so (Andi Kleen) - Allow resolving the DSO name with 'perf script -F brstack{sym,off},dso' (Mark Santaniello) - Add perf tooling unwind support for PowerPC (Paolo Bonzini) - ... and various other improvements as well" * 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (84 commits) perf auxtrace: Add CPU filter support perf intel-pt: Do not use TSC packets for calculating CPU cycles to TSC perf intel-pt: Update documentation to include new ptwrite and power events perf intel-pt: Add example script for power events and PTWRITE perf intel-pt: Synthesize new power and "ptwrite" events perf intel-pt: Move code in intel_pt_synth_events() to simplify attr setting perf intel-pt: Factor out intel_pt_set_event_name() perf intel-pt: Tidy messages into called function intel_pt_synth_event() perf intel-pt: Tidy Intel PT evsel lookup into separate function perf intel-pt: Join needlessly wrapped lines perf intel-pt: Remove unused instructions_sample_period perf intel-pt: Factor out common code synthesizing event samples perf script: Add synthesized Intel PT power and ptwrite events perf/x86/intel: Constify the 'lbr_desc[]' array and make a function static perf script: Add 'synth' field for synthesized event payloads perf auxtrace: Add itrace option to output power events perf auxtrace: Add itrace option to output ptwrite events tools include: Add byte-swapping macros to kernel.h perf script: Add 'synth' event type for synthesized events x86/insn: perf tools: Add new ptwrite instruction ...
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/core.c30
1 files changed, 15 insertions, 15 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 6c4e523dc1e2..bc63f8db1b0d 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -925,11 +925,6 @@ static inline int is_cgroup_event(struct perf_event *event)
return 0;
}
-static inline u64 perf_cgroup_event_cgrp_time(struct perf_event *event)
-{
- return 0;
-}
-
static inline void update_cgrp_time_from_event(struct perf_event *event)
{
}
@@ -5729,9 +5724,6 @@ static void perf_output_read_one(struct perf_output_handle *handle,
__output_copy(handle, values, n * sizeof(u64));
}
-/*
- * XXX PERF_FORMAT_GROUP vs inherited events seems difficult.
- */
static void perf_output_read_group(struct perf_output_handle *handle,
struct perf_event *event,
u64 enabled, u64 running)
@@ -5776,6 +5768,13 @@ static void perf_output_read_group(struct perf_output_handle *handle,
#define PERF_FORMAT_TOTAL_TIMES (PERF_FORMAT_TOTAL_TIME_ENABLED|\
PERF_FORMAT_TOTAL_TIME_RUNNING)
+/*
+ * XXX PERF_SAMPLE_READ vs inherited events seems difficult.
+ *
+ * The problem is that its both hard and excessively expensive to iterate the
+ * child list, not to mention that its impossible to IPI the children running
+ * on another CPU, from interrupt/NMI context.
+ */
static void perf_output_read(struct perf_output_handle *handle,
struct perf_event *event)
{
@@ -9193,7 +9192,7 @@ static int perf_try_init_event(struct pmu *pmu, struct perf_event *event)
static struct pmu *perf_init_event(struct perf_event *event)
{
- struct pmu *pmu = NULL;
+ struct pmu *pmu;
int idx;
int ret;
@@ -9462,9 +9461,10 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
local64_set(&hwc->period_left, hwc->sample_period);
/*
- * we currently do not support PERF_FORMAT_GROUP on inherited events
+ * We currently do not support PERF_SAMPLE_READ on inherited events.
+ * See perf_output_read().
*/
- if (attr->inherit && (attr->read_format & PERF_FORMAT_GROUP))
+ if (attr->inherit && (attr->sample_type & PERF_SAMPLE_READ))
goto err_ns;
if (!has_branch_stack(event))
@@ -9477,9 +9477,7 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
}
pmu = perf_init_event(event);
- if (!pmu)
- goto err_ns;
- else if (IS_ERR(pmu)) {
+ if (IS_ERR(pmu)) {
err = PTR_ERR(pmu);
goto err_ns;
}
@@ -9492,8 +9490,10 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
event->addr_filters_offs = kcalloc(pmu->nr_addr_filters,
sizeof(unsigned long),
GFP_KERNEL);
- if (!event->addr_filters_offs)
+ if (!event->addr_filters_offs) {
+ err = -ENOMEM;
goto err_per_task;
+ }
/* force hw sync on the address filters */
event->addr_filters_gen = 1;