From: Johannes Weiner <hannes@cmpxchg.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Chris Wilson <chris@chris-wilson.co.uk>,
intel-gfx@lists.freedesktop.org, "Goel,
Akash" <akash.goel@intel.com>,
linux-mm@kvack.org
Subject: Re: [PATCH v2 1/2] mm: Export nr_swap_pages
Date: Mon, 7 Dec 2015 11:48:31 -0500 [thread overview]
Message-ID: <20151207164831.GA7256@cmpxchg.org> (raw)
In-Reply-To: <20151207134812.GA20782@dhcp22.suse.cz>
On Mon, Dec 07, 2015 at 02:48:12PM +0100, Michal Hocko wrote:
> On Fri 04-12-15 15:58:53, Chris Wilson wrote:
> > Some modules, like i915.ko, use swappable objects and may try to swap
> > them out under memory pressure (via the shrinker). Before doing so, they
> > want to check using get_nr_swap_pages() to see if any swap space is
> > available as otherwise they will waste time purging the object from the
> > device without recovering any memory for the system. This requires the
> > nr_swap_pages counter to be exported to the modules.
>
> I guess it should be sufficient to change get_nr_swap_pages into a real
> function and export it rather than giving the access to the counter
> directly?
What do you mean by "sufficient"? That is actually more work.
It should be sufficient to just export the counter.
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next prev parent reply other threads:[~2015-12-07 16:48 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-04 15:58 [PATCH v2 1/2] mm: Export nr_swap_pages Chris Wilson
2015-12-04 15:58 ` [PATCH v2 2/2] drm/i915: Disable shrinker for non-swapped backed objects Chris Wilson
2015-12-04 16:11 ` Johannes Weiner
2015-12-10 9:34 ` Daniel Vetter
2015-12-04 16:09 ` [PATCH v2 1/2] mm: Export nr_swap_pages Johannes Weiner
2015-12-10 9:32 ` [Intel-gfx] " Daniel Vetter
2015-12-23 22:04 ` Johannes Weiner
2015-12-23 22:26 ` Andrew Morton
2016-01-05 10:05 ` Daniel Vetter
2015-12-07 13:48 ` Michal Hocko
2015-12-07 16:48 ` Johannes Weiner [this message]
2015-12-07 17:04 ` Michal Hocko
2015-12-07 18:02 ` Johannes Weiner
2015-12-07 18:10 ` [Intel-gfx] " Dave Gordon
2015-12-07 19:13 ` Johannes Weiner
2015-12-08 11:19 ` Dave Gordon
2015-12-08 11:22 ` Michal Hocko
2015-12-17 18:15 ` [PATCH v3] mm: Export {__}get_nr_swap_pages() Dave Gordon
2015-12-17 19:45 ` Johannes Weiner
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