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Arnaldo Carvalho de Melo 97c79a38cd perf core: Per event callchain limit 
Additionally to being able to control the system wide maximum depth via
/proc/sys/kernel/perf_event_max_stack, now we are able to ask for
different depths per event, using perf_event_attr.sample_max_stack for
that.

This uses an u16 hole at the end of perf_event_attr, that, when
perf_event_attr.sample_type has the PERF_SAMPLE_CALLCHAIN, if
sample_max_stack is zero, means use perf_event_max_stack, otherwise
it'll be bounds checked under callchain_mutex.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
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>
Cc: Wang Nan <wangnan0@huawei.com>
Cc: Zefan Li <lizefan@huawei.com>
Link: http://lkml.kernel.org/n/tip-kolmn1yo40p7jhswxwrc7rrd@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 		2016-05-30 12:41:44 -03:00
..
Makefile bpf: introduce percpu_freelist 2016-03-08 15:28:31 -05:00
arraymap.c bpf: check for reserved flag bits in array and stack maps 2016-03-08 15:28:31 -05:00
core.c bpf: Mark __bpf_prog_run() stack frame as non-standard 2016-02-29 08:35:11 +01:00
hashtab.c bpf: pre-allocate hash map elements 2016-03-08 15:28:31 -05:00
helpers.c bpf: avoid copying junk bytes in bpf_get_current_comm() 2016-03-09 23:27:30 -05:00
inode.c bpf: fix refcnt overflow 2016-04-28 17:29:45 -04:00
percpu_freelist.c bpf: introduce percpu_freelist 2016-03-08 15:28:31 -05:00
percpu_freelist.h bpf: introduce percpu_freelist 2016-03-08 15:28:31 -05:00
stackmap.c perf core: Per event callchain limit 2016-05-30 12:41:44 -03:00
syscall.c bpf: fix refcnt overflow 2016-04-28 17:29:45 -04:00
verifier.c bpf: fix check_map_func_compatibility logic 2016-04-28 17:29:45 -04:00