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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Alexander Duyck <alexander.duyck@gmail.com>
Cc: wei.w.wang@intel.com, Nitesh Narayan Lal <nitesh@redhat.com>,
	kvm list <kvm@vger.kernel.org>,
	David Hildenbrand <david@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Yang Zhang <yang.zhang.wz@gmail.com>,
	pagupta@redhat.com, Rik van Riel <riel@surriel.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	lcapitulino@redhat.com, Andrea Arcangeli <aarcange@redhat.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	dan.j.williams@intel.com,
	Alexander Duyck <alexander.h.duyck@linux.intel.com>
Subject: use of shrinker in virtio balloon free page hinting
Date: Wed, 17 Jul 2019 07:20:33 -0400
Message-ID: <20190717071332-mutt-send-email-mst@kernel.org> (raw)

Wei, others,

ATM virtio_balloon_shrinker_scan will only get registered
when deflate on oom feature bit is set.

Not sure whether that's intentional.  Assuming it is:

virtio_balloon_shrinker_scan will try to locate and free
pages that are processed by host.
The above seems broken in several ways:
- count ignores the free page list completely
- if free pages are being reported, pages freed
  by shrinker will just get re-allocated again

I was unable to make this part of code behave in any reasonable
way - was shrinker usage tested? What's a good way to test that?

Thanks!

-- 
MST

             reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-17 11:20 Michael S. Tsirkin [this message]
2019-07-17 11:32 ` David Hildenbrand
2019-07-17 14:10 ` David Hildenbrand
2019-07-17 14:34   ` Michael S. Tsirkin
2019-07-17 14:38     ` David Hildenbrand
2019-07-17 15:46 ` Wang, Wei W
2019-07-18  4:13   ` Michael S. Tsirkin
2019-07-18  5:57     ` Wei Wang
2019-07-18  5:58       ` Michael S. Tsirkin
2019-07-18  6:30         ` Wei Wang
2019-07-18  6:47           ` Michael S. Tsirkin
2019-07-18  9:08             ` Wei Wang

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