From: Rik van Riel <riel@redhat.com>
To: aarcange@redhat.com
Cc: linux-mm@kvack.org, Mel Gorman <mel@csn.ul.ie>,
Johannes Weiner <jweiner@redhat.com>,
Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH 2 of 3] mremap: avoid sending one IPI per page
Date: Wed, 10 Aug 2011 20:16:34 -0400 [thread overview]
Message-ID: <4E431F62.5030704@redhat.com> (raw)
In-Reply-To: <cbe9e822c59a912e9f76.1312649884@localhost>
On 08/06/2011 12:58 PM, aarcange@redhat.com wrote:
> From: Andrea Arcangeli<aarcange@redhat.com>
>
> This replaces ptep_clear_flush() with ptep_get_and_clear() and a single
> flush_tlb_range() at the end of the loop, to avoid sending one IPI for each
> page.
>
> The mmu_notifier_invalidate_range_start/end section is enlarged accordingly but
> this is not going to fundamentally change things. It was more by accident that
> the region under mremap was for the most part still available for secondary
> MMUs: the primary MMU was never allowed to reliably access that region for the
> duration of the mremap (modulo trapping SIGSEGV on the old address range which
> sounds unpractical and flakey). If users wants secondary MMUs not to lose
> access to a large region under mremap
Userspace programs do not get reliable access to memory
that is currently being mremapped. This patch does not
change that situation in the least.
> Signed-off-by: Andrea Arcangeli<aarcange@redhat.com>
Acked-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2011-08-11 0:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-06 16:58 [PATCH 0 of 3] THP: mremap support and TLB optimization #3 aarcange
2011-08-06 16:58 ` [PATCH 1 of 3] mremap: check for overflow using deltas aarcange
2011-08-08 8:20 ` Johannes Weiner
2011-08-10 10:48 ` Mel Gorman
2011-08-11 0:14 ` Rik van Riel
2011-08-06 16:58 ` [PATCH 2 of 3] mremap: avoid sending one IPI per page aarcange
2011-08-08 8:23 ` Johannes Weiner
2011-08-10 10:55 ` Mel Gorman
2011-08-11 0:16 ` Rik van Riel [this message]
2011-08-06 16:58 ` [PATCH 3 of 3] thp: mremap support and TLB optimization aarcange
2011-08-08 8:25 ` Johannes Weiner
2011-08-10 11:01 ` Mel Gorman
2011-08-11 0:26 ` Rik van Riel
2011-08-23 21:14 ` Andrew Morton
2011-08-23 22:13 ` Andrea Arcangeli
2011-08-23 22:25 ` Andrea Arcangeli
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