Date: Thu, 13 Mar 2003 10:31:15 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/kern kern_ktrace.c src/sys/sys ktrace.h Message-ID: <200303131831.h2DIVFbb075792@repoman.freebsd.org>
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jhb 2003/03/13 10:31:15 PST
FreeBSD src repository
Modified files:
sys/kern kern_ktrace.c
sys/sys ktrace.h
Log:
Add a new userland-visible ktrace flag KTR_DROP and an internal ktrace flag
KTRFAC_DROP to track instances when ktrace events are dropped due to the
request pool being exhausted. When a thread tries to post a ktrace event
and is unable to due to no available ktrace request objects, it sets
KTRFAC_DROP in its process' p_traceflag field. The next trace event to
successfully post from that process will set the KTR_DROP flag in the
header of the request going out and clear KTRFAC_DROP.
The KTR_DROP flag is the high bit in the type field of the ktr_header
structure. Older kdump binaries will simply complain about an unknown type
when seeing an entry with KTR_DROP set. Note that KTR_DROP being set on a
record in a ktrace file does not tell you anything except that at least one
event from this process was dropped prior to this event. The user has no
way of knowing what types of events were dropped nor how many were dropped.
Requested by: phk
Revision Changes Path
1.83 +6 -1 src/sys/kern/kern_ktrace.c
1.26 +7 -0 src/sys/sys/ktrace.h
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