From: "Stone, Joshua I" <joshua.i.stone@intel.com>
To: "William Cohen" <wcohen@redhat.com>
Cc: "SystemTAP" <systemtap@sources.redhat.com>,
"Maynard Johnson" <maynardj@us.ibm.com>
Subject: RE: Proposed systemtap access to perfmon hardware
Date: Thu, 23 Mar 2006 17:09:00 -0000 [thread overview]
Message-ID: <CBDB88BFD06F7F408399DBCF8776B3DC06BFAA89@scsmsx403.amr.corp.intel.com> (raw)
William Cohen wrote:
> As far as when the performance counters are set up and torn down it
> seems like it would be most reasonable to set them up before the first
> probe begin action and tear them down after the last probe end action.
I agree
> This would mean for sampling would need to have it stop sampling if
> don't want any additional samples while doing the probe end action.
This should be gated for you by using the session_state. Begin probes
only run during STAP_SESSION_STARTING, normal probes (including permon
sampling) should only run during STAP_SESSION_RUNNING, and end probes
only run during STAP_SESSION_STOPPING. If a probe is entered during a
state that doesn't match what it expects, it just returns with out
taking any action.
Josh
next reply other threads:[~2006-03-23 17:09 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-23 17:09 Stone, Joshua I [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-03-22 23:46 Stone, Joshua I
2006-03-23 12:54 ` Maynard Johnson
2006-03-23 14:46 ` William Cohen
2006-03-22 23:23 Stone, Joshua I
2006-03-22 19:09 Stone, Joshua I
2006-03-22 20:04 ` Frank Ch. Eigler
2006-03-15 16:24 William Cohen
2006-03-15 22:34 ` Frank Ch. Eigler
2006-03-17 16:20 ` William Cohen
2006-03-17 17:10 ` Bill Rugolsky Jr.
2006-03-17 17:34 ` Frank Ch. Eigler
2006-03-17 20:26 ` William Cohen
2006-03-20 17:27 ` Frank Ch. Eigler
2006-03-22 3:34 ` Maynard Johnson
2006-03-22 18:02 ` William Cohen
2006-03-22 22:16 ` Maynard Johnson
2006-03-22 18:30 ` Frank Ch. Eigler
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