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Re: [updated patch] malloc per-thread cache ready for review
- From: Joseph Myers <joseph at codesourcery dot com>
- To: DJ Delorie <dj at redhat dot com>
- Cc: Carlos O'Donell <carlos at redhat dot com>, <siddhesh at gotplt dot org>, <libc-alpha at sourceware dot org>, <fweimer at redhat dot com>
- Date: Wed, 5 Jul 2017 20:13:10 +0000
- Subject: Re: [updated patch] malloc per-thread cache ready for review
- Authentication-results: sourceware.org; auth=none
- References: <xn8tk2y7i4.fsf@greed.delorie.com>
On Wed, 5 Jul 2017, DJ Delorie wrote:
> diff -x .git -x po -rup glibc.pristine/NEWS glibc.djmalloc-tcache/NEWS
> --- glibc.pristine/NEWS 2017-06-26 17:13:13.080645103 -0400
> +++ glibc.djmalloc-tcache/NEWS 2017-07-05 15:59:37.735381015 -0400
> @@ -7,6 +7,14 @@ using `glibc' in the "product" field.
>
> Version 2.26
>
> +* A per-thread cache has been added to malloc. Access to the cache requires
> + no locks and therefore significantly accelerates the fast path to allocate
> + and free small amounts of memory. Refilling an empty cache requires locking
> + the underlying arena. Performance measurements show significant gains in a
> + wide variety of user workloads. Workloads were captured using a special
> + instrumented malloc and analyzed with a malloc simulator. Contributed by
> + DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
To be clear, this belongs in the "Major new features:" section of the
current NEWS file, which has been rearranged since the version this diff
is relative to, *not* just below the "Version 2.26" header.
--
Joseph S. Myers
joseph@codesourcery.com