[PATCH -tip 2/3] Add coredump tracepoint

[Masami Hiramatsu]

Roland McGrath wrote:
>> Oh, so SystemTap is the motivator of these tracepoints?
>
> Nope.  My suggestion about arguments to pass was just generic based on the
> innate context of this tracepoint.
>
>> Do you know about exact usecases where these tracepoints would be
>> utilized? Would be interesting (and relevant) to list them.
>
> Masami's colleagues do have something in particular in mind,
> but I'm not sure whether they intend to use systemtap as part
> of the implementation of that or not.

Yeah, we'd like to use this tracepoint to analyze coredump
miss-configuration. Sometimes, users miss-configure dump-filter
and rlimit, that will cause system-slowdown when several processes,
which share a large amount of memory among them (e.g. database),
start core-dump with shared memory. And then, it can cause a
system-switching on HA cluster system.

With this tracepoint, we can analyze why the coredumps were slow.

Thank you,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com