From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <sourceware-bugzilla@sourceware.org>
Received: by sourceware.org (Postfix, from userid 48)
 id C60F6385801A; Wed, 10 Aug 2022 04:00:28 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org C60F6385801A
From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug malloc/14581] memalign allocations are often not reused after
 free
Date: Wed, 10 Aug 2022 04:00:28 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: glibc
X-Bugzilla-Component: malloc
X-Bugzilla-Version: 2.15
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: carlos at redhat dot com
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: carlos at redhat dot com
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: security-
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-14581-131-mVjCxgz9Mg@http.sourceware.org/bugzilla/>
In-Reply-To: <bug-14581-131@http.sourceware.org/bugzilla/>
References: <bug-14581-131@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: glibc-bugs@sourceware.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Glibc-bugs mailing list <glibc-bugs.sourceware.org>
List-Unsubscribe: <https://sourceware.org/mailman/options/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=unsubscribe>
List-Archive: <https://sourceware.org/pipermail/glibc-bugs/>
List-Help: <mailto:glibc-bugs-request@sourceware.org?subject=help>
List-Subscribe: <https://sourceware.org/mailman/listinfo/glibc-bugs>,
 <mailto:glibc-bugs-request@sourceware.org?subject=subscribe>
X-List-Received-Date: Wed, 10 Aug 2022 04:00:28 -0000

https://sourceware.org/bugzilla/show_bug.cgi?id=3D14581

--- Comment #19 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to mirh from comment #18)
> The Fedora patch was backed out hours after the last comment here, but
> there's now new steam behind it.=20
> https://patchwork.sourceware.org/project/glibc/patch/xn4jz19fts.fsf@greed.
> delorie.com/

Yes, the original Fedora patch was incomplete. I reverted it and set it asi=
de
as we worked on other things. We're coming back to this work again to impro=
ve
the reuse of aligned allocations.

Just a note that Ruby, which was a driving use case for fixing the aligned
allocation reuse, has entirely switched to mmap to allocate aligned pages t=
hat
it needs for internal uses.

While we still want to fix this issue, it's really bad external fragmentati=
on,
but Ruby is no longer a specific problem.

If you get a chance, please feel free to try out DJ's latest patch and comm=
ent.

--=20
You are receiving this mail because:
You are on the CC list for the bug.=