From: Luigi Semenzato <semenzato@google.com>
To: Minchan Kim <minchan@kernel.org>
Cc: Linux Memory Management List <linux-mm@kvack.org>,
Tim Murray <timmurray@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
vinmenon@codeaurora.org
Subject: swapping file pages
Date: Fri, 21 Apr 2017 11:26:45 -0700 [thread overview]
Message-ID: <CAA25o9SP_Axuhvrr-YNYdfj=NHjX1KaDrE-EOmw1gHYS2PpZCw@mail.gmail.com> (raw)
On an SSD used by a typical chromebook (i.e. the one on my desk right
now), it takes about 300us to read a random 4k page, but it takes less
than 10us to lzo-decompress a page from the zram device.
Code compresses reasonably well (down to almost 50% for x86_64,
although only 66% for ARM32), so I may be better off swapping file
pages to zram, rather than reading them back from the SSD. Before I
even get started trying to do this, can anybody tell me if this is a
stupid idea? Or possibly a good idea, but totally impractical from an
implementation perspective?
Thanks!
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next reply other threads:[~2017-04-21 18:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-21 18:26 Luigi Semenzato [this message]
2017-04-24 6:40 ` Minchan Kim
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