From: Andrew Morton <email@example.com> To: Alexander Duyck <firstname.lastname@example.org> Cc: Alexander Duyck <email@example.com>, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org, email@example.com, firstname.lastname@example.org Subject: Re: [PATCH v17 0/9] mm / virtio: Provide support for free page reporting Date: Tue, 11 Feb 2020 16:19:27 -0800 [thread overview] Message-ID: <email@example.com> (raw) In-Reply-To: <firstname.lastname@example.org> On Tue, 11 Feb 2020 15:55:31 -0800 Alexander Duyck <email@example.com> wrote: > On the host I just have to monitor /proc/meminfo and I can see the > difference. I get the following results on the host, in the enabled case > it takes about 30 seconds for it to settle into the final state since I > only report page a bit at a time: > Baseline/Applied > MemTotal: 131963012 kB > MemFree: 95189740 kB > > Enabled: > MemTotal: 131963012 kB > MemFree: 126459472 kB > > This is what I was referring to with the comment above. I had a test I was > running back around the first RFC that consisted of bringing up enough VMs > so that there was a bit of memory overcommit and then having the VMs in > turn run memhog. As I recall the difference between the two was something > like a couple minutes to run through all the VMs as the memhog would take > up to 40+ seconds for one that was having to pull from swap while it took > only 5 to 7 seconds for the VMs that were all running the page hinting. > > I had referenced it here in the RFC: > https://firstname.lastname@example.org/ > > I have been verifying the memory has been getting freed but didn't feel > like the test added much value so I haven't added it to the cover page for > a while since the time could vary widely and is dependent on things like > the disk type used for the host swap since my SSD is likely faster than > spinning rust, but may not be as fast as other SSDs on the market. Since > the disk speed can play such a huge role I wasn't comfortable posting > numbers since the benefits could vary so widely. OK, thanks. I'll add the patches to the mm pile. The new mm/page_reporting.c is unreviewed afaict, so I guess you own that for now ;) It would be very nice to get some feedback from testers asserting "yes, this really helped my workload" but I understand this sort of testing is hard to obtain at this stage.
next prev parent reply other threads:[~2020-02-12 0:19 UTC|newest] Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-11 22:45 Alexander Duyck 2020-02-11 22:46 ` [PATCH v17 1/9] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck 2020-02-11 22:46 ` [PATCH v17 2/9] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck 2020-02-11 22:46 ` [PATCH v17 3/9] mm: Add function __putback_isolated_page Alexander Duyck 2020-02-19 14:33 ` Mel Gorman 2020-02-11 22:46 ` [PATCH v17 4/9] mm: Introduce Reported pages Alexander Duyck 2020-02-19 14:55 ` Mel Gorman 2020-02-20 18:44 ` Alexander Duyck 2020-02-20 22:35 ` Mel Gorman 2020-02-21 19:25 ` Alexander Duyck 2020-02-21 20:19 ` Mel Gorman 2020-02-11 22:46 ` [PATCH v17 5/9] virtio-balloon: Pull page poisoning config out of free page hinting Alexander Duyck 2020-02-11 22:46 ` [PATCH v17 6/9] virtio-balloon: Add support for providing free page reports to host Alexander Duyck 2020-02-11 22:47 ` [PATCH v17 7/9] mm/page_reporting: Rotate reported pages to the tail of the list Alexander Duyck 2020-02-19 14:59 ` Mel Gorman 2020-02-11 22:47 ` [PATCH v17 8/9] mm/page_reporting: Add budget limit on how many pages can be reported per pass Alexander Duyck 2020-02-19 15:02 ` Mel Gorman 2020-02-11 22:47 ` [PATCH v17 9/9] mm/page_reporting: Add free page reporting documentation Alexander Duyck 2020-02-11 22:51 ` [PATCH v17 QEMU 1/3] virtio-ballon: Implement support for page poison tracking feature Alexander Duyck 2020-02-11 22:51 ` [PATCH v17 QEMU 2/3] virtio-balloon: Add support for providing free page reports to host Alexander Duyck 2020-02-11 22:51 ` [PATCH v17 QEMU 3/3] virtio-balloon: Provide a interface for free page reporting Alexander Duyck 2020-02-11 22:53 ` [PATCH v17 QEMU 4/3 RFC] memory: Add support for MADV_FREE as mechanism to lazy discard pages Alexander Duyck 2020-02-11 23:05 ` [PATCH v17 0/9] mm / virtio: Provide support for free page reporting Andrew Morton 2020-02-11 23:55 ` Alexander Duyck 2020-02-12 0:19 ` Andrew Morton [this message] 2020-02-12 1:19 ` Alexander Duyck 2020-02-18 16:37 ` Alexander Duyck 2020-02-19 8:49 ` Mel Gorman 2020-02-19 15:06 ` Mel Gorman
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