Author: fabient
Date: Tue Dec 8 19:18:32 2009
New Revision: 200271
URL: http://svn.freebsd.org/changeset/base/200271
Log:
MFC 198464:
Inform hwpmc(4) of a thread's impending demise prior to invoking
sched_throw().
Modified:
stable/7/sys/kern/kern_thread.c
Directory Properties:
stable/7/sys/ (props changed)
stable/7/sys/contrib/pf/ (props changed)
Modified: stable/7/sys/kern/kern_thread.c
==============================================================================
--- stable/7/sys/kern/kern_thread.c Tue Dec 8 19:12:38 2009
(r200270)
+++ stable/7/sys/kern/kern_thread.c Tue Dec 8 19:18:32 2009
(r200271)
@@ -26,6 +26,8 @@
* DAMAGE.
*/
+#include "opt_hwpmc_hooks.h"
+
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
@@ -44,6 +46,9 @@ __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>
@@ -497,6 +502,14 @@ 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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