From: fche@redhat.com (Frank Ch. Eigler)
To: David Smith <dsmith@redhat.com>
Cc: Systemtap List <systemtap@sourceware.org>, pcp <pcp@oss.sgi.com>
Subject: Re: systemtap/pcp integration
Date: Fri, 18 Jul 2014 15:49:00 -0000 [thread overview]
Message-ID: <y0miomuk6qa.fsf@fche.csb> (raw)
In-Reply-To: <53C83CB9.3020808@redhat.com> (David Smith's message of "Thu, 17 Jul 2014 16:14:33 -0500")
Hi, David -
> Here's a small update on the prototype systemtap/pcp integration work
> I'm doing.
Thanks, what a great start.
> I've create a systemtap branch, called 'dsmith/mmv' that contains
> all my work. Basically this work allows systemtap to create 'mmv'
> memory mapped files.
(That's git://sourceware.org/git/systemtap.git branch dsmith/mmv.)
> [...] The code works for the attached script, but I'm sure it is
> quite fragile. Things like locking, error checking, documentation,
> etc. need to be done. [...]
Overall, are you happy with the general approach of reusing the exact
MMV format (and thus the PMDA)?
At one point I suggested reworking the earlier prototype so that the
bulk of the MMV format's emulation would be based on tapset script
code (and possibly more declarative / dynamic / safe) rather than C.
Have you come to any conclusions about the propriety of that?
How much post-initialization change can the MMV format tolerate, as
regarding indom contents or metric availability? I assume such
metadata changes are synchronized with the PMDA via the generation
numbers. Moving around contents of the mmap region as in
__stp_mmv_alloc_data_item sounds like it leaves the data inconsistent
during the process; does it need similar protection?
- FChE
next prev parent reply other threads:[~2014-07-18 15:49 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-17 21:14 David Smith
2014-07-18 15:49 ` Frank Ch. Eigler [this message]
2014-07-18 17:02 ` David Smith
2014-07-18 18:27 ` Frank Ch. Eigler
2014-07-22 14:25 ` David Smith
2014-07-22 15:21 ` Frank Ch. Eigler
2014-07-22 21:02 ` David Smith
2014-07-18 21:10 ` [pcp] " William Cohen
2014-07-21 15:43 ` David Smith
2014-07-21 15:54 ` William Cohen
2014-07-22 1:32 ` Nathan Scott
2014-07-22 2:57 ` Frank Ch. Eigler
2014-07-22 14:50 ` [pcp] " David Smith
2014-07-23 10:29 ` Nathan Scott
2014-07-23 14:42 ` Frank Ch. Eigler
2014-07-24 7:40 ` Nathan Scott
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