From: Hillf Danton <hdanton@sina.com>
To: Alexander Graf <graf@amazon.com>
Cc: Hillf Danton <hdanton@sina.com>,
Alexander Duyck <alexander.duyck@gmail.com>,
kvm@vger.kernel.org, mst@redhat.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
akpm@linux-foundation.org, mgorman@techsingularity.net,
Minchan Kim <minchan@kernel.org>,
vbabka@suse.cz
Subject: Re: [PATCH v16.1 0/9] mm / virtio: Provide support for free page reporting
Date: Sat, 25 Jan 2020 10:01:26 +0800 [thread overview]
Message-ID: <20200125020126.3348-1-hdanton@sina.com> (raw)
In-Reply-To: <20200124132352.12824-1-hdanton@sina.com>
On Fri, 24 Jan 2020 17:40:51 +0100 Alexander Graf wrote:
>
> On 24.01.20 14:23, Hillf Danton wrote:
> >
> > On Thu, 23 Jan 2020 11:20:07 +0100 Alexander Graf wrote:
> >>
> >> The big problem I see is that what I really want from a user's point of
> >> view is a tuneable that says "Automatically free clean page cache pages
> >> that were not accessed in the last X minutes".
> >
> > A diff is made on top of 1a4e58cce84e ("mm: introduce MADV_PAGEOUT") without
> > test in any form, assuming it goes in line with the tunable above but without
> > "X minutes" taken into account.
> >
<snip>
> >
> > --- a/include/uapi/asm-generic/mman-common.h
> > +++ b/include/uapi/asm-generic/mman-common.h
> > @@ -69,6 +69,7 @@
> >
> > #define MADV_COLD 20 /* deactivate these pages */
> > #define MADV_PAGEOUT 21 /* reclaim these pages */
> > +#define MADV_CCPC 22 /* reclaim cold & clean page cache pages */
>
> This patch adds a new madvise flag. I have a hard time seeing how that
> would help with the "full system expiry" of pages?
>
It works on the basis of individual process now. Shrinking all ccpc
pages in the system without memory pressure...they will be reclaimed
once memory becomes tight.
> The basic point that I tried to make above was that I would ideally like
> to have a coldness cutoff date at which you can be pretty confident that
> page cache data is no longer needed.
>
The X minutes need another define like
#define MADV_DCPC 23 /* deactivate clean page cache pages */
> To work properly, this needs to be transparent to any normal process on
> the system :).
then task-A on the system can hint kernel like
madvise(MADV_DCPC); /* make clean pc pages cold */
X minutes go by; /* sieve out hot pages */
madvise(MADV_CCPC); /* shrink ccpc */
next prev parent reply other threads:[~2020-01-25 2:01 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 17:43 Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 1/9] mm: Adjust shuffle code to allow for future coalescing Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 2/9] mm: Use zone and order instead of free area in free_list manipulators Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 3/9] mm: Add function __putback_isolated_page Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 4/9] mm: Introduce Reported pages Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 5/9] virtio-balloon: Pull page poisoning config out of free page hinting Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 6/9] virtio-balloon: Add support for providing free page reports to host Alexander Duyck
2020-02-11 11:03 ` David Hildenbrand
2020-02-11 11:47 ` Michael S. Tsirkin
2020-02-11 12:19 ` David Hildenbrand
2020-02-11 14:07 ` Michael S. Tsirkin
2020-02-11 14:31 ` David Hildenbrand
2020-02-11 14:48 ` Michael S. Tsirkin
2020-02-11 15:13 ` David Hildenbrand
2020-02-11 16:33 ` Alexander Duyck
2020-02-11 17:04 ` David Hildenbrand
2020-01-22 17:43 ` [PATCH v16.1 7/9] mm/page_reporting: Rotate reported pages to the tail of the list Alexander Duyck
2020-01-22 17:43 ` [PATCH v16.1 8/9] mm/page_reporting: Add budget limit on how many pages can be reported per pass Alexander Duyck
2020-01-22 17:44 ` [PATCH v16.1 9/9] mm/page_reporting: Add free page reporting documentation Alexander Duyck
2020-01-23 10:20 ` [PATCH v16.1 0/9] mm / virtio: Provide support for free page reporting Alexander Graf
2020-01-23 14:05 ` David Hildenbrand
2020-01-23 14:52 ` Alexander Graf
2020-01-24 13:25 ` David Hildenbrand
2020-01-24 16:20 ` David Hildenbrand
2020-01-23 16:26 ` Alexander Duyck
2020-01-23 16:54 ` Alexander Graf
2020-01-23 18:33 ` Alexander Duyck
2020-01-23 18:47 ` Graf (AWS), Alexander
2020-01-23 22:05 ` Alexander Duyck
2020-01-23 17:20 ` Dave Hansen
2020-01-23 19:23 ` Konrad Rzeszutek Wilk
2020-01-23 19:17 ` Johannes Weiner
2020-01-23 22:29 ` Alexander Duyck
2020-01-23 23:24 ` Dave Hansen
2020-01-24 13:23 ` Hillf Danton
2020-01-24 16:40 ` Alexander Graf
2020-01-25 2:01 ` Hillf Danton [this message]
2020-02-03 22:05 ` Alexander Duyck
2020-02-10 19:18 ` Should I repost? (was: Re: [PATCH v16.1 0/9] mm / virtio: Provide support for free page reporting) Alexander Duyck
2020-02-11 10:40 ` Mel Gorman
2020-02-11 22:57 ` Alexander Duyck
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