linux-kernel - Aligning tcmalloc with glibc 2.35 rseq ABI

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Date:   Tue, 1 Feb 2022 09:58:16 -0500 (EST)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Chris Kennelly <ckennelly@...gle.com>
Cc:     Paul Turner <pjt@...gle.com>, Peter Oskolkov <posk@...k.io>,
        Florian Weimer <fweimer@...hat.com>,
        libc-alpha <libc-alpha@...rceware.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Aligning tcmalloc with glibc 2.35 rseq ABI

Hi Chris,

You will probably want to have a look at the userspace rseq ABI exposed by glibc 2.35 to ensure
tcmalloc becomes compatible with it.

If it helps, you can have a look at how I modified librseq to play nicely with glibc 2.35:

https://git.kernel.org/pub/scm/libs/librseq/librseq.git/

Most relevant bits:

https://git.kernel.org/pub/scm/libs/librseq/librseq.git/tree/src/rseq.c#n108

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com