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From: Michal Hocko <mhocko@kernel.org>
To: Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-api@vger.kernel.org, Johannes Weiner <hannes@cmpxchg.org>,
	Tim Murray <timmurray@google.com>,
	Joel Fernandes <joel@joelfernandes.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Daniel Colascione <dancol@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	Sonny Rao <sonnyrao@google.com>,
	Brian Geffon <bgeffon@google.com>,
	jannh@google.com, oleg@redhat.com, christian@brauner.io,
	oleksandr@redhat.com, hdanton@sina.com
Subject: Re: [RFCv2 3/6] mm: introduce MADV_PAGEOUT
Date: Fri, 31 May 2019 10:50:44 +0200
Message-ID: <20190531085044.GJ6896@dhcp22.suse.cz> (raw)
In-Reply-To: <20190531064313.193437-4-minchan@kernel.org>

On Fri 31-05-19 15:43:10, Minchan Kim wrote:
> When a process expects no accesses to a certain memory range
> for a long time, it could hint kernel that the pages can be
> reclaimed instantly but data should be preserved for future use.
> This could reduce workingset eviction so it ends up increasing
> performance.
> 
> This patch introduces the new MADV_PAGEOUT hint to madvise(2)
> syscall. MADV_PAGEOUT can be used by a process to mark a memory
> range as not expected to be used for a long time so that kernel
> reclaims the memory instantly. The hint can help kernel in deciding
> which pages to evict proactively.

Again, are there any restictions on what kind of memory can be paged out?
Private/Shared, anonymous/file backed. Any restrictions on mapping type.
Etc. Please make sure all that is in the changelog.

What are the failure modes? E.g. what if the swap is full, does the call
fails or it silently ignores the error?

Thanks!
-- 
Michal Hocko
SUSE Labs

  reply index

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-31  6:43 [RFCv2 0/6] introduce memory hinting API for external process Minchan Kim
2019-05-31  6:43 ` [RFCv2 1/6] mm: introduce MADV_COLD Minchan Kim
2019-05-31  8:47   ` Michal Hocko
2019-05-31 13:39     ` Minchan Kim
2019-05-31 14:03       ` Michal Hocko
2019-05-31 14:34         ` Minchan Kim
2019-06-03  7:16           ` Michal Hocko
2019-06-03 15:43             ` Daniel Colascione
2019-06-03 17:27             ` Johannes Weiner
2019-06-03 20:32               ` Michal Hocko
2019-06-03 21:50                 ` Johannes Weiner
2019-06-03 23:02                   ` Minchan Kim
2019-06-04  6:56                     ` Michal Hocko
2019-06-04 12:06                     ` Johannes Weiner
2019-06-04  6:55                   ` Michal Hocko
2019-06-04  4:26             ` Minchan Kim
2019-06-04  7:02               ` Michal Hocko
2019-05-31  6:43 ` [RFCv2 2/6] mm: change PAGEREF_RECLAIM_CLEAN with PAGE_REFRECLAIM Minchan Kim
2019-05-31  6:43 ` [RFCv2 3/6] mm: introduce MADV_PAGEOUT Minchan Kim
2019-05-31  8:50   ` Michal Hocko [this message]
2019-05-31 13:44     ` Minchan Kim
2019-05-31 16:59   ` Johannes Weiner
2019-05-31 23:14     ` Minchan Kim
2019-05-31  6:43 ` [RFCv2 4/6] mm: factor out madvise's core functionality Minchan Kim
2019-05-31  7:04   ` Oleksandr Natalenko
2019-05-31 13:12     ` Minchan Kim
2019-05-31 14:35       ` Oleksandr Natalenko
2019-05-31 23:29         ` Minchan Kim
2019-06-05 13:27           ` Oleksandr Natalenko
2019-06-10 10:12             ` Minchan Kim
2019-05-31  6:43 ` [RFCv2 5/6] mm: introduce external memory hinting API Minchan Kim
2019-05-31  8:37   ` Michal Hocko
2019-05-31 13:19     ` Minchan Kim
2019-05-31 14:00       ` Michal Hocko
2019-05-31 14:11         ` Minchan Kim
2019-05-31 17:35   ` Daniel Colascione
2019-05-31  6:43 ` [RFCv2 6/6] mm: extend process_madvise syscall to support vector arrary Minchan Kim
2019-05-31 10:06   ` Yann Droneaud
2019-05-31 23:18     ` Minchan Kim

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