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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>
Subject: Re: [PATCH 3/5] mm/vmscan: Throttle reclaim when no progress is being made
Date: Wed, 22 Sep 2021 07:46:58 +1000	[thread overview]
Message-ID: <163226081891.21861.1286773174123207227@noble.neil.brown.name> (raw)
In-Reply-To: <20210921111630.GR3959@techsingularity.net>

On Tue, 21 Sep 2021, Mel Gorman wrote:
> On Tue, Sep 21, 2021 at 09:31:30AM +1000, NeilBrown wrote:
> > On Mon, 20 Sep 2021, Mel Gorman wrote:
> > > +
> > > +		reclaim_throttle(pgdat, VMSCAN_THROTTLE_NOPROGRESS, HZ/10);
> > 
> > We always seem to pass "HZ/10" to reclaim_throttle().  Should we just
> > hard-code that in the one place inside reclaim_throttle() itself?
> > 
> 
> do_writepages passes in HZ/50. I'm not sure if these values even have
> any special meaning, I think it's more likely they were pulled out of
> the air based on the speed of some disk in the past and then copied.
> It's another reason why I want the wakeups to be based on events within
> the mm as much as possible.

Yes, I saw the HZ/50 shortly after writing that email :-)
I agree with your guess for the source of these numbers.  I still think
we should pull them all from the same piece of air.
Hopefully, once these changes are properly understood and the events
reliably come as expected, we can make it quite large (HZ?) with minimal
cost.

Thanks,
NeilBrown


> 
> -- 
> Mel Gorman
> SUSE Labs
> 
> 

  reply	other threads:[~2021-09-21 21:47 UTC|newest]

Thread overview: 33+ 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
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
2021-09-21 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 [this message]
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 3/5] mm/vmscan: Throttle reclaim when no progress is being made Mel Gorman

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