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Subject[RFC 1/8] perf: Block perf calls for system call tracepoints
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hi,
Steven asked for possibility to block traced process
in case the tracer can't keep up and we would loose
events.

This (RFC) patchset tries to implement this by adding
'block' bool in struct perf_event_attr to be set only
for syscalls tracepoints and adding code to block the
traced process, if there's no space in event's ring
buffer.

The blocking code will poll/periodically check for the
space and continue if the event was successfully written.

Available also here:
git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
perf/block

Thoughts?

thanks,
jirka


---
Jiri Olsa (8):
perf: Allow to block process in syscall tracepoints
perf tools: Sync uapi perf_event.h
perf record: Add --block option
perf trace: Add --block option
perf tools: Add block term support for tracepoints
perf tools: Add ordered_events__flush_time interface
perf trace: Move event delivery to deliver_event function
perf trace: Add ordered processing for --block option

arch/x86/entry/common.c | 36 ++++++++++++++++++++++++++++++++++--
include/linux/perf_event.h | 2 ++
include/linux/sched.h | 2 ++
include/linux/syscalls.h | 2 ++
include/uapi/linux/perf_event.h | 3 ++-
kernel/events/core.c | 40 ++++++++++++++++++++++++++++++++++++++--
kernel/events/ring_buffer.c | 4 +++-
kernel/trace/trace_event_perf.c | 4 ++++
kernel/trace/trace_syscalls.c | 28 ++++++++++++++++++++++++----
tools/include/uapi/linux/perf_event.h | 3 ++-
tools/perf/builtin-record.c | 9 +++++++++
tools/perf/builtin-trace.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
tools/perf/perf.h | 1 +
tools/perf/util/evsel.c | 7 +++++++
tools/perf/util/evsel.h | 2 ++
tools/perf/util/ordered-events.c | 34 ++++++++++++++++++++++++++++++----
tools/perf/util/ordered-events.h | 3 +++
tools/perf/util/parse-events.c | 8 ++++++++
tools/perf/util/parse-events.h | 1 +
tools/perf/util/parse-events.l | 1 +
20 files changed, 263 insertions(+), 24 deletions(-)

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