/proc output - improve scalability

PATCH Applied Jan Kiszka 1 participant 1 message Jul 7, 2006

Share & tools

Jan Kiszka

author

2006-07-07 21:00 UTC #0 lore raw

PATCH 1/2 /proc output - improve scalability

This is an unmodified resent of my previously posted patch to make /proc/xenomai/{sched,stat} O(1) wrt nklock. It also solve a potential race during thread cleanup when accessing the dying thread's name.

Jan

---
 include/nucleus/pod.h |    1 
 ksrc/nucleus/module.c |   94 +++++++++++++++++++++++++++++++++-----------------
 ksrc/nucleus/pod.c    |    2 +
 3 files changed, 66 insertions(+), 31 deletions(-)

include/nucleus/pod.h +1 -0

Index: xenomai/include/nucleus/pod.h
===================================================================
@@ -195,6 +195,7 @@ struct xnpod {
     xnsched_t sched[XNARCH_NR_CPUS]; /*!< Per-cpu scheduler slots. */
 
     xnqueue_t threadq;          /*!< All existing threads. */
+    int threadq_rev;            /*!< Modification counter of threadq. */
 
     volatile u_long schedlck;	/*!< Scheduler lock count. */

ksrc/nucleus/module.c +63 ~~-31~~

169 lines not on this page · raw message

ksrc/nucleus/pod.c +2 -0

Index: xenomai/ksrc/nucleus/pod.c
===================================================================
@@ -815,6 +815,7 @@ int xnpod_init_thread(xnthread_t *thread
 	xnlock_get_irqsave(&nklock, s);
 	thread->sched = xnpod_current_sched();
 	appendq(&nkpod->threadq, &thread->glink);
+	nkpod->threadq_rev++;
 	xnpod_suspend_thread(thread, XNDORMANT | (flags & XNSUSP), XN_INFINITE,
 			     NULL);
 	xnlock_put_irqrestore(&nklock, s);

@@ -1225,6 +1226,7 @@ void xnpod_delete_thread(xnthread_t *thr
 	sched = thread->sched;
 
 	removeq(&nkpod->threadq, &thread->glink);
+	nkpod->threadq_rev++;
 
 	if (!testbits(thread->status, XNTHREAD_BLOCK_BITS)) {
 		if (testbits(thread->status, XNREADY)) {