From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Andy Lutomirski <luto@amacapital.net>,
Dave Hansen <dave.hansen@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org
Subject: PCID and TLB flushes (was: [GIT PULL] kdbus for 4.1-rc1)
Date: Wed, 29 Apr 2015 01:15:53 +0300 [thread overview]
Message-ID: <20150428221553.GA5770@node.dhcp.inet.fi> (raw)
On Tue, Apr 28, 2015 at 01:42:10PM -0700, Andy Lutomirski wrote:
> At some point, I'd like to implement PCID on x86 (if no one beats me
> to it, and this is a low priority for me), which will allow us to skip
> expensive TLB flushes while context switching. I have no idea whether
> ARM can do something similar.
I talked with Dave about implementing PCID and he thinks that it will be
net loss. TLB entries will live longer and it means we would need to trigger
more IPIs to flash them out when we have to. Cost of IPIs will be higher
than benifit from hot TLB after context switch.
Do you have different expectations?
--
Kirill A. Shutemov
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next reply other threads:[~2015-04-28 22:16 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-28 22:15 Kirill A. Shutemov [this message]
2015-04-28 22:38 ` Dave Hansen
2015-04-28 22:41 ` Rik van Riel
2015-04-28 22:54 ` Andy Lutomirski
2015-04-28 22:56 ` Rik van Riel
2015-04-28 23:01 ` Andy Lutomirski
2015-04-28 23:19 ` Linus Torvalds
2015-04-28 23:16 ` Linus Torvalds
2015-04-28 23:23 ` Andy Lutomirski
2015-04-28 23:38 ` Linus Torvalds
2015-04-28 23:49 ` Andy Lutomirski
2015-04-28 22:56 ` Linus Torvalds
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