svn commit: r198464 - head/sys/kern
Joseph Koshy
jkoshy at FreeBSD.org
Sun Oct 25 04:34:48 UTC 2009
Author: jkoshy
Date: Sun Oct 25 04:34:47 2009
New Revision: 198464
URL: http://svn.freebsd.org/changeset/base/198464
Log:
Inform hwpmc(4) of a thread's impending demise prior to invoking sched_throw().
Debugging help: fabient
Review and testing by: fabient
Modified:
head/sys/kern/kern_thread.c
Modified: head/sys/kern/kern_thread.c
==============================================================================
--- head/sys/kern/kern_thread.c Sun Oct 25 02:48:29 2009 (r198463)
+++ head/sys/kern/kern_thread.c Sun Oct 25 04:34:47 2009 (r198464)
@@ -27,6 +27,7 @@
*/
#include "opt_witness.h"
+#include "opt_hwpmc_hooks.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
@@ -47,6 +48,9 @@ __FBSDID("$FreeBSD$");
#include <sys/ktr.h>
#include <sys/umtx.h>
#include <sys/cpuset.h>
+#ifdef HWPMC_HOOKS
+#include <sys/pmckern.h>
+#endif
#include <security/audit/audit.h>
@@ -417,6 +421,14 @@ thread_exit(void)
panic ("thread_exit: Last thread exiting on its own");
}
}
+#ifdef HWPMC_HOOKS
+ /*
+ * If this thread is part of a process that is being tracked by hwpmc(4),
+ * inform the module of the thread's impending exit.
+ */
+ if (PMC_PROC_IS_USING_PMCS(td->td_proc))
+ PMC_SWITCH_CONTEXT(td, PMC_FN_CSW_OUT);
+#endif
PROC_UNLOCK(p);
thread_lock(td);
/* Save our tick information with both the thread and proc locked */
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