Author: jhb
Date: Thu Aug 19 16:40:30 2010
New Revision: 211514
URL: http://svn.freebsd.org/changeset/base/211514
Log:
There isn't really a need to hold the ktrace mutex just to read the value
of p_traceflag that is stored in the kinfo_proc structure. It is still
racey even with the lock and the code will read a consistent snapshot of
the flag without the lock.
Modified:
head/sys/kern/kern_proc.c
Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c Thu Aug 19 16:39:00 2010 (r211513)
+++ head/sys/kern/kern_proc.c Thu Aug 19 16:40:30 2010 (r211514)
@@ -64,10 +64,6 @@ __FBSDID("$FreeBSD$");
#include <sys/jail.h>
#include <sys/vnode.h>
#include <sys/eventhandler.h>
-#ifdef KTRACE
-#include <sys/uio.h>
-#include <sys/ktrace.h>
-#endif
#ifdef DDB
#include <ddb/ddb.h>
@@ -717,9 +713,7 @@ fill_kinfo_proc_only(struct proc *p, str
kp->ki_textvp = p->p_textvp;
#ifdef KTRACE
kp->ki_tracep = p->p_tracevp;
- mtx_lock(&ktrace_mtx);
kp->ki_traceflag = p->p_traceflag;
- mtx_unlock(&ktrace_mtx);
#endif
kp->ki_fd = p->p_fd;
kp->ki_vmspace = p->p_vmspace;
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