Author: fabient
Date: Tue Dec 8 18:23:52 2009
New Revision: 200266
URL: http://svn.freebsd.org/changeset/base/200266
Log:
MFC 198464:
Inform hwpmc(4) of a thread's impending demise prior to invoking
sched_throw().
Modified:
stable/8/sys/kern/kern_thread.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
stable/8/sys/dev/xen/xenpci/ (props changed)
Modified: stable/8/sys/kern/kern_thread.c
==============================================================================
--- stable/8/sys/kern/kern_thread.c Tue Dec 8 18:23:51 2009
(r200265)
+++ stable/8/sys/kern/kern_thread.c Tue Dec 8 18:23:52 2009
(r200266)
@@ -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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