From: "NeilBrown" <neilb@suse.de>
To: "Mel Gorman" <mgorman@techsingularity.net>
Cc: "Linux-MM" <linux-mm@kvack.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-fsdevel" <linux-fsdevel@vger.kernel.org>,
"LKML" <linux-kernel@vger.kernel.org>,
"Mel Gorman" <mgorman@techsingularity.net>
Subject: Re: [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested
Date: Tue, 21 Sep 2021 10:13:17 +1000 [thread overview]
Message-ID: <163218319798.3992.1165186037496786892@noble.neil.brown.name> (raw)
In-Reply-To: <20210920085436.20939-2-mgorman@techsingularity.net>
On Mon, 20 Sep 2021, Mel Gorman wrote:
> -long wait_iff_congested(int sync, long timeout)
> -{
> - long ret;
> - unsigned long start = jiffies;
> - DEFINE_WAIT(wait);
> - wait_queue_head_t *wqh = &congestion_wqh[sync];
> -
> - /*
> - * If there is no congestion, yield if necessary instead
> - * of sleeping on the congestion queue
> - */
> - if (atomic_read(&nr_wb_congested[sync]) == 0) {
> - cond_resched();
> -
> - /* In case we scheduled, work out time remaining */
> - ret = timeout - (jiffies - start);
> - if (ret < 0)
> - ret = 0;
> -
> - goto out;
> - }
> -
> - /* Sleep until uncongested or a write happens */
> - prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
Uninterruptible wait.
....
> +static void
> +reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason,
> + long timeout)
> +{
> + wait_queue_head_t *wqh = &pgdat->reclaim_wait;
> + unsigned long start = jiffies;
> + long ret;
> + DEFINE_WAIT(wait);
> +
> + atomic_inc(&pgdat->nr_reclaim_throttled);
> + WRITE_ONCE(pgdat->nr_reclaim_start,
> + node_page_state(pgdat, NR_THROTTLED_WRITTEN));
> +
> + prepare_to_wait(wqh, &wait, TASK_INTERRUPTIBLE);
Interruptible wait.
Why the change? I think these waits really need to be TASK_UNINTERRUPTIBLE.
Thanks,
NeilBrown
next prev parent reply other threads:[~2021-09-21 0:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-20 8:54 [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/ Mel Gorman
2021-09-20 8:54 ` [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
2021-09-20 23:19 ` NeilBrown
2021-09-21 11:12 ` Mel Gorman
2021-09-21 21:27 ` NeilBrown
2021-09-21 0:13 ` NeilBrown [this message]
2021-09-21 10:58 ` Mel Gorman
2021-09-21 21:40 ` NeilBrown
2021-09-22 6:04 ` Dave Chinner
2021-09-22 8:03 ` Mel Gorman
2021-09-22 12:16 ` Hillf Danton
2021-09-22 14:13 ` Mel Gorman
2021-09-20 8:54 ` [PATCH 2/5] mm/vmscan: Throttle reclaim and compaction when too may pages are isolated Mel Gorman
2021-09-20 23:27 ` NeilBrown
2021-09-21 11:03 ` Mel Gorman
2021-09-21 18:45 ` Yang Shi
2021-09-22 8:11 ` Mel Gorman
2021-09-20 8:54 ` [PATCH 3/5] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman
2021-09-20 23:31 ` NeilBrown
2021-09-21 11:16 ` Mel Gorman
2021-09-21 21:46 ` NeilBrown
2021-09-22 9:21 ` Mel Gorman
2021-09-20 8:54 ` [PATCH 4/5] mm/writeback: Throttle based on page writeback instead of congestion Mel Gorman
2021-09-20 8:54 ` [PATCH 5/5] mm/page_alloc: Remove the throttling logic from the page allocator Mel Gorman
2021-09-20 11:42 ` [RFC PATCH 0/5] Remove dependency on congestion_wait in mm/ Matthew Wilcox
2021-09-20 12:50 ` Mel Gorman
2021-09-20 14:11 ` David Sterba
2021-09-21 11:18 ` Mel Gorman
2021-09-20 19:51 ` Mel Gorman
2021-09-21 20:46 ` Dave Chinner
2021-09-22 17:52 ` Mel Gorman
2021-09-29 10:09 [PATCH 0/5] Remove dependency on congestion_wait in mm/ v2 Mel Gorman
2021-09-29 10:09 ` [PATCH 1/5] mm/vmscan: Throttle reclaim until some writeback completes if congested Mel Gorman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=163218319798.3992.1165186037496786892@noble.neil.brown.name \
--to=neilb@suse.de \
--cc=adilger.kernel@dilger.ca \
--cc=corbet@lwn.net \
--cc=david@fromorbit.com \
--cc=djwong@kernel.org \
--cc=hannes@cmpxchg.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@techsingularity.net \
--cc=mhocko@suse.com \
--cc=riel@surriel.com \
--cc=tytso@mit.edu \
--cc=vbabka@suse.cz \
--cc=willy@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).