Messages in this thread Patch in this message | | | From | "Anil" <> | Subject | RE: [PATCH] speedup flush_workqueue for singlethread_workqueue | Date | Mon, 7 Jun 2004 10:46:50 -0700 |
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Hi Andrew, In the flush_workqueue, can we move lock_cpu_hotplug()/unlock_cpu_hotplug only for _non_single_threaded_ case as shown below as these locks are not required for single_threaded_workqueue.
Thanks, Anil
The attached patch applies on top of your changes. Signed-off-by: Anil Keshavamurthy <anil.s.keshavamurthy@intel.com> ---
linux-2.6.7-rc2-mm2-root/kernel/workqueue.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff -puN kernel/workqueue.c~andrew2 kernel/workqueue.c --- linux-2.6.7-rc2-mm2/kernel/workqueue.c~andrew2 2004-06-07 18:45:20.332139681 -0700 +++ linux-2.6.7-rc2-mm2-root/kernel/workqueue.c 2004-06-07 18:46:09.560680511 -0700 @@ -262,7 +262,6 @@ static void flush_cpu_workqueue(struct c void fastcall flush_workqueue(struct workqueue_struct *wq) { might_sleep(); - lock_cpu_hotplug(); if (is_single_threaded(wq)) { /* Always use cpu 0's area. */ @@ -270,11 +269,12 @@ void fastcall flush_workqueue(struct wor } else { int cpu; + lock_cpu_hotplug(); for_each_online_cpu(cpu) flush_cpu_workqueue(wq->cpu_wq + cpu); + unlock_cpu_hotplug(); } - unlock_cpu_hotplug(); } static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq, _
>-----Original Message----- >From: Rusty Russell [mailto:rusty@rustcorp.com.au] >Sent: Saturday, June 05, 2004 7:11 PM >To: Andrew Morton >Cc: Keshavamurthy, Anil S; lkml - Kernel Mailing List >Subject: Re: [PATCH] speedup flush_workqueue for singlethread_workqueue > >On Sat, 2004-06-05 at 08:30, Andrew Morton wrote: >> "Anil" <anil.s.keshavamurthy@intel.com> wrote: >> > >> > In the flush_workqueue function for a >single_threaded_worqueue case >> > the code seemed to loop the same cpu_workqueue_struct for >> > each_online_cpu's. The attached patch checks this >condition and bails out of for loop there by speeding up the >flush_workqueue for a singlethreaded_workqueue. >> >> >> OK, thanks. I think it's a bit clearer to do it as below. >I haven't >> tested it though. > >Me neither, but agree. > >Rusty. >-- >Anyone who quotes me in their signature is an idiot -- Rusty Russell > > >
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