commit a831100aeefbe6d9f3e47a3e2712f82c042f1f5c
author Arnaldo Carvalho de Melo <acme@redhat.com> Tue May 10 16:34:53 2016 -0300
committer Arnaldo Carvalho de Melo <acme@redhat.com> Mon May 16 23:11:49 2016 -0300
tree 7771949ed9e7c8519edab809c4cbd4aa5731d104
parent 0a77582f0407e7f9b5d775bebc31297a1b890be0

perf core: Generalize max_stack sysctl handler

So that it can be used for other stack related knobs, such as the
upcoming one to tweak the max number of of contexts per stack sample.

In all those cases we can only change the value if there are no perf
sessions collecting stacks, so they need to grab that mutex, etc.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-8t3fk94wuzp8m2z1n4gc0s17@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>