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Date: Thu, 6 Feb 2020 10:49:22 +0100 From: David Hildenbrand <david@...hat.com> To: "Wang, Wei W" <wei.w.wang@...el.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "virtualization@...ts.linux-foundation.org" <virtualization@...ts.linux-foundation.org> Cc: "tysand@...gle.com" <tysand@...gle.com>, "mst@...hat.com" <mst@...hat.com>, "alexander.h.duyck@...ux.intel.com" <alexander.h.duyck@...ux.intel.com>, "rientjes@...gle.com" <rientjes@...gle.com>, "mhocko@...nel.org" <mhocko@...nel.org>, "namit@...are.com" <namit@...are.com>, "penguin-kernel@...ove.SAKURA.ne.jp" <penguin-kernel@...ove.SAKURA.ne.jp> Subject: Re: [PATCH RFC] virtio_balloon: conservative balloon page shrinking On 06.02.20 10:44, Wang, Wei W wrote: > On Thursday, February 6, 2020 5:32 PM, David Hildenbrand wrote: >> >> If the page cache is empty, a drop_slab() will deflate the whole balloon if I >> am not wrong. >> >> Especially, a echo 3 > /proc/sys/vm/drop_caches >> >> will first drop the page cache and then drop_slab() > > Then that's the problem of "echo 3 > /proc/sys/vm/drop_cache" itself. It invokes other shrinkers as well (if considered an issue), need to be tweaked in the mm. In short, I don't like this approach as long as a drop_slab() can deflate the whole balloon and don't think this is the right approach then. -- Thanks, David / dhildenb
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