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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-22 22:19:21 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-22 22:19:21 (GMT) |
commit | c58267e9fa7b0345dd9006939254701e3622ca6a (patch) | |
tree | 9a96adabaa1c61ecbb9e5e8653d5085dad27ef07 /kernel | |
parent | 1bf7067c6e173dc10411704db48338ed69c05565 (diff) | |
parent | a9a3cd900fbbcbf837d65653105e7bfc583ced09 (diff) | |
download | linux-c58267e9fa7b0345dd9006939254701e3622ca6a.tar.xz |
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf updates from Ingo Molnar:
"Kernel side changes mostly consist of work on x86 PMU drivers:
- x86 Intel PT (hardware CPU tracer) improvements (Alexander
Shishkin)
- x86 Intel CQM (cache quality monitoring) improvements (Thomas
Gleixner)
- x86 Intel PEBSv3 support (Peter Zijlstra)
- x86 Intel PEBS interrupt batching support for lower overhead
sampling (Zheng Yan, Kan Liang)
- x86 PMU scheduler fixes and improvements (Peter Zijlstra)
There's too many tooling improvements to list them all - here are a
few select highlights:
'perf bench':
- Introduce new 'perf bench futex' benchmark: 'wake-parallel', to
measure parallel waker threads generating contention for kernel
locks (hb->lock). (Davidlohr Bueso)
'perf top', 'perf report':
- Allow disabling/enabling events dynamicaly in 'perf top':
a 'perf top' session can instantly become a 'perf report'
one, i.e. going from dynamic analysis to a static one,
returning to a dynamic one is possible, to toogle the
modes, just press 'f' to 'freeze/unfreeze' the sampling. (Arnaldo Carvalho de Melo)
- Make Ctrl-C stop processing on TUI, allowing interrupting the load of big
perf.data files (Namhyung Kim)
'perf probe': (Masami Hiramatsu)
- Support glob wildcards for function name
- Support $params special probe argument: Collect all function arguments
- Make --line checks validate C-style function name.
- Add --no-inlines option to avoid searching inline functions
- Greatly speed up 'perf probe --list' by caching debuginfo.
- Improve --filter support for 'perf probe', allowing using its arguments
on other commands, as --add, --del, etc.
'perf sched':
- Add option in 'perf sched' to merge like comms to lat output (Josef Bacik)
Plus tons of infrastructure work - in particular preparation for
upcoming threaded perf report support, but also lots of other work -
and fixes and other improvements. See (much) more details in the
shortlog and in the git log"
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (305 commits)
perf tools: Configurable per thread proc map processing time out
perf tools: Add time out to force stop proc map processing
perf report: Fix sort__sym_cmp to also compare end of symbol
perf hists browser: React to unassigned hotkey pressing
perf top: Tell the user how to unfreeze events after pressing 'f'
perf hists browser: Honour the help line provided by builtin-{top,report}.c
perf hists browser: Do not exit when 'f' is pressed in 'report' mode
perf top: Replace CTRL+z with 'f' as hotkey for enable/disable events
perf annotate: Rename source_line_percent to source_line_samples
perf annotate: Display total number of samples with --show-total-period
perf tools: Ensure thread-stack is flushed
perf top: Allow disabling/enabling events dynamicly
perf evlist: Add toggle_enable() method
perf trace: Fix race condition at the end of started workloads
perf probe: Speed up perf probe --list by caching debuginfo
perf probe: Show usage even if the last event is skipped
perf tools: Move libtraceevent dynamic list to separated LDFLAGS variable
perf tools: Fix a problem when opening old perf.data with different byte order
perf tools: Ignore .config-detected in .gitignore
perf probe: Fix to return error if no probe is added
...
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/events/core.c | 39 | ||||
-rw-r--r-- | kernel/events/internal.h | 9 | ||||
-rw-r--r-- | kernel/sched/core.c | 2 |
3 files changed, 37 insertions, 13 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index eddf1ed..9e0773d 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5381,9 +5381,9 @@ void perf_prepare_sample(struct perf_event_header *header, } } -static void perf_event_output(struct perf_event *event, - struct perf_sample_data *data, - struct pt_regs *regs) +void perf_event_output(struct perf_event *event, + struct perf_sample_data *data, + struct pt_regs *regs) { struct perf_output_handle handle; struct perf_event_header header; @@ -5975,6 +5975,39 @@ void perf_event_aux_event(struct perf_event *event, unsigned long head, } /* + * Lost/dropped samples logging + */ +void perf_log_lost_samples(struct perf_event *event, u64 lost) +{ + struct perf_output_handle handle; + struct perf_sample_data sample; + int ret; + + struct { + struct perf_event_header header; + u64 lost; + } lost_samples_event = { + .header = { + .type = PERF_RECORD_LOST_SAMPLES, + .misc = 0, + .size = sizeof(lost_samples_event), + }, + .lost = lost, + }; + + perf_event_header__init_id(&lost_samples_event.header, &sample, event); + + ret = perf_output_begin(&handle, event, + lost_samples_event.header.size); + if (ret) + return; + + perf_output_put(&handle, lost_samples_event); + perf_event__output_id_sample(event, &handle, &sample); + perf_output_end(&handle); +} + +/* * IRQ throttle logging */ diff --git a/kernel/events/internal.h b/kernel/events/internal.h index 9f6ce9b..2deb24c 100644 --- a/kernel/events/internal.h +++ b/kernel/events/internal.h @@ -72,15 +72,6 @@ static inline bool rb_has_aux(struct ring_buffer *rb) void perf_event_aux_event(struct perf_event *event, unsigned long head, unsigned long size, u64 flags); -extern void -perf_event_header__init_id(struct perf_event_header *header, - struct perf_sample_data *data, - struct perf_event *event); -extern void -perf_event__output_id_sample(struct perf_event *event, - struct perf_output_handle *handle, - struct perf_sample_data *sample); - extern struct page * perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff); diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 1236732..db9b10a 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1049,7 +1049,7 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) if (p->sched_class->migrate_task_rq) p->sched_class->migrate_task_rq(p, new_cpu); p->se.nr_migrations++; - perf_sw_event_sched(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 0); + perf_event_task_migrate(p); } __set_task_cpu(p, new_cpu); |