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Re: [PATCH -tip 2/3] Add coredump tracepoint
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