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From: "Darrick J. Wong" <djwong@kernel.org>
To: Chandan Babu R <chandanbabu@kernel.org>
Cc: linux-xfs@vger.kernel.org, cem@kernel.org
Subject: Re: [PATCH 1/2] libfrog: Prevent unnecessary waking of worker thread when using bounded workqueues
Date: Tue, 4 Nov 2025 08:54:04 -0800	[thread overview]
Message-ID: <20251104165404.GG196370@frogsfrogsfrogs> (raw)
In-Reply-To: <20251104091439.1276907-1-chandanbabu@kernel.org>

On Tue, Nov 04, 2025 at 02:44:36PM +0530, Chandan Babu R wrote:
> When woken up, a worker will pick a work item from the workqueue and wake up
> another worker when the current workqueue is a bounded workqueue and if there
> is atleast one more work item remains to be processed.
> 
> The commit 12838bda12e669 ("libfrog: fix overly sleep workqueues") prevented
> single-threaded processing of work items by waking up sleeping workers when a
> work item is added to the workqueue. Hence the earlier described mechanism of
> waking workers is no longer required.
> 
> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

That makes sense to me, sorry for forgetting to remove this hunk.
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>

--D

> ---
>  libfrog/workqueue.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/libfrog/workqueue.c b/libfrog/workqueue.c
> index db5b3f68b..9384270ff 100644
> --- a/libfrog/workqueue.c
> +++ b/libfrog/workqueue.c
> @@ -51,10 +51,6 @@ workqueue_thread(void *arg)
>  		wq->next_item = wi->next;
>  		wq->item_count--;
>  
> -		if (wq->max_queued && wq->next_item) {
> -			/* more work, wake up another worker */
> -			pthread_cond_signal(&wq->wakeup);
> -		}
>  		wq->active_threads++;
>  		pthread_mutex_unlock(&wq->lock);
>  
> -- 
> 2.45.2
> 
> 

      parent reply	other threads:[~2025-11-04 16:54 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-04  9:14 [PATCH 1/2] libfrog: Prevent unnecessary waking of worker thread when using bounded workqueues Chandan Babu R
2025-11-04  9:14 ` [PATCH 2/2] repair/prefetch.c: Create one workqueue with multiple workers Chandan Babu R
2025-11-04 10:59   ` Christoph Hellwig
2025-11-04 16:55   ` Darrick J. Wong
2025-11-06  4:01     ` Chandan Babu R
2025-11-04 10:58 ` [PATCH 1/2] libfrog: Prevent unnecessary waking of worker thread when using bounded workqueues Christoph Hellwig
2025-11-04 16:54 ` Darrick J. Wong [this message]

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