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Re: Restartable Sequences system call merged into Linux

From: Florian Weimer <fweimer at redhat dot com>
To: Mathieu Desnoyers <mathieu dot desnoyers at efficios dot com>, Carlos O'Donell <carlos at redhat dot com>
Cc: Peter Zijlstra <peterz at infradead dot org>, "Paul E. McKenney" <paulmck at linux dot vnet dot ibm dot com>, Boqun Feng <boqun dot feng at gmail dot com>, Thomas Gleixner <tglx at linutronix dot de>, linux-kernel <linux-kernel at vger dot kernel dot org>, libc-alpha <libc-alpha at sourceware dot org>
Date: Mon, 11 Jun 2018 21:55:38 +0200
Subject: Re: Restartable Sequences system call merged into Linux
References: <1084280721.10859.1528746558696.JavaMail.zimbra@efficios.com>

On 06/11/2018 09:49 PM, Mathieu Desnoyers wrote:

It should be noted that there can be only one rseq TLS area registered per thread,
which can then be used by many libraries and by the executable, so this is a
process-wide (per-thread) resource that we need to manage carefully.

Is it possible to resize the area after thread creation, perhaps evenfrom other threads?

If there is only one contiguous area, this generally means there needsto be linker support, similar to what we have for initial-exec TLS today.


Thanks,
Florian

Follow-Ups:
- Re: Restartable Sequences system call merged into Linux
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References:
- Restartable Sequences system call merged into Linux
  - From: Mathieu Desnoyers

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