From: Keith Busch <keith.busch@intel.com>
To: Tejun Heo <tj@kernel.org>
Cc: linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm/swap: lru drain on memory reclaim workqueue
Date: Tue, 31 May 2016 17:13:08 -0400 [thread overview]
Message-ID: <20160531211308.GE24107@localhost.localdomain> (raw)
In-Reply-To: <20160531210116.GA14868@mtj.duckdns.org>
On Tue, May 31, 2016 at 05:01:16PM -0400, Tejun Heo wrote:
> So, WQ_MEM_RECLAIM on a shared workqueue doesn't make much sense.
> That flag guarantees single concurrency level to the workqueue. How
> would multiple users of a shared workqueue coordinate around that?
> What prevents one events_mem_unbound user from depending on, say,
> draining lru? If lru draining requires a rescuer to guarantee forward
> progress under memory pressure, that rescuer worker must be dedicated
> for that purpose and can't be shared.
Gotchya, that fixes my understanding on the rescuer thread operation. In
this case, could we revive your previous proposal for consideration?
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prev parent reply other threads:[~2016-05-31 21:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-31 20:50 Keith Busch
2016-05-31 21:01 ` Tejun Heo
2016-05-31 21:13 ` Keith Busch [this message]
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