From: Mel Gorman <mgorman@techsingularity.net>
To: NeilBrown <neilb@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Theodore Ts'o <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
"Darrick J . Wong" <djwong@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Michal Hocko <mhocko@suse.com>,
Dave Chinner <david@fromorbit.com>,
Rik van Riel <riel@surriel.com>, Vlastimil Babka <vbabka@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
Jonathan Corbet <corbet@lwn.net>, Linux-MM <linux-mm@kvack.org>,
Linux-fsdevel <linux-fsdevel@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 0/8] Remove dependency on congestion_wait in mm/
Date: Fri, 22 Oct 2021 14:17:32 +0100 [thread overview]
Message-ID: <20211022131732.GK3959@techsingularity.net> (raw)
In-Reply-To: <163490199006.17149.17259708448207042563@noble.neil.brown.name>
On Fri, Oct 22, 2021 at 10:26:30PM +1100, NeilBrown wrote:
> On Fri, 22 Oct 2021, Mel Gorman wrote:
> > On Fri, Oct 22, 2021 at 12:15:10PM +1100, NeilBrown wrote:
> >
> > > In general, I still don't like the use of wake_up_all(), though it won't
> > > cause incorrect behaviour.
> > >
> >
> > Removing wake_up_all would be tricky.
>
> I think there is a misunderstanding. Removing wake_up_all() is as
> simple as
> s/wake_up_all/wake_up/
>
> If you used prepare_to_wait_exclusive(), then wake_up() would only wake
> one waiter, while wake_up_all() would wake all of them.
> As you use prepare_to_wait(), wake_up() will wake all waiters - as will
> wake_up_all().
>
Ok, yes, there was a misunderstanding. I thought you were suggesting a
move to exclusive wakeups. I felt that the wake_up_all was explicit in
terms of intent and that I really meant for all tasks to wake instead of
one at a time.
--
Mel Gorman
SUSE Labs
next prev parent reply other threads:[~2021-10-22 13:17 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 9:01 [PATCH v4 0/8] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-10-19 9:01 ` [PATCH 1/8] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
2021-10-19 9:01 ` [PATCH 2/8] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman
2021-10-19 17:12 ` Yang Shi
2021-10-19 9:01 ` [PATCH 3/8] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman
2021-10-19 9:01 ` [PATCH 4/8] mm/writeback: Throttle based on page writeback instead of congestion Mel Gorman
2021-10-19 9:01 ` [PATCH 5/8] mm/page_alloc: Remove the throttling logic from the page allocator Mel Gorman
2021-10-19 9:20 ` Vlastimil Babka
2021-10-19 9:01 ` [PATCH 6/8] mm/vmscan: Centralise timeout values for reclaim_throttle Mel Gorman
2021-10-22 1:06 ` NeilBrown
2021-10-22 8:12 ` Mel Gorman
2021-10-19 9:01 ` [PATCH 7/8] mm/vmscan: Increase the timeout if page reclaim is not making progress Mel Gorman
2021-10-22 1:07 ` NeilBrown
2021-10-22 8:14 ` Mel Gorman
2021-10-19 9:01 ` [PATCH 8/8] mm/vmscan: Delay waking of tasks throttled on NOPROGRESS Mel Gorman
2021-10-19 22:00 ` [PATCH v4 0/8] Remove dependency on congestion_wait in mm/ Andrew Morton
2021-10-20 8:44 ` Mel Gorman
2021-10-22 1:15 ` NeilBrown
2021-10-22 8:39 ` Mel Gorman
2021-10-22 11:26 ` NeilBrown
2021-10-22 13:17 ` Mel Gorman [this message]
2021-10-27 0:43 ` NeilBrown
2021-10-27 10:13 ` Mel Gorman
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