From: Rik van Riel <riel@surriel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, kernel-team@fb.com,
Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH] mm: align larger anonymous mappings on THP boundaries
Date: Mon, 08 Aug 2022 20:59:06 -0400 [thread overview]
Message-ID: <dca37bf523dfd946101cab465c173cfc5bd954d5.camel@surriel.com> (raw)
In-Reply-To: <20220808150931.49e9940bfc350227fc63b420@linux-foundation.org>
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On Mon, 2022-08-08 at 15:09 -0700, Andrew Morton wrote:
> On Mon, 8 Aug 2022 16:46:58 -0400 Rik van Riel <riel@surriel.com>
> wrote:
>
> > Align larger anonymous memory mappings on THP boundaries by
> > going through thp_get_unmapped_area if THPs are enabled for
> > the current process.
> >
> > With this patch, larger anonymous mappings are now THP aligned
> > when checking in /proc/PID/maps, but only when THP is enabled
> > for that process.
> >
>
> What are the runtime effects of this change?
The runtime effect is that when a malloc library
allocates an arena that is a multiple of 2MB in size,
the entire arena can be mapped using THPs, resulting in
a lower TLB miss rate.
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next prev parent reply other threads:[~2022-08-09 0:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-08 20:46 Rik van Riel
2022-08-08 22:09 ` Andrew Morton
2022-08-09 0:59 ` Rik van Riel [this message]
2022-08-09 17:16 ` Yang Shi
2022-08-09 17:36 ` Rik van Riel
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