lkml.org 
[lkml]   [2018]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Restartable Sequences system call merged into Linux
----- On Jun 11, 2018, at 3:55 PM, Florian Weimer fweimer@redhat.com wrote:

> 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 even
> from other threads?

I'm not sure why we would want to resize it. The per-thread area is fixed-size.
Its layout is here: include/uapi/linux/rseq.h: struct rseq

The ABI is designed so that all users (program and libraries) can interact
through this per-thread TLS area.

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

Not entirely sure what you imply by "one contiguous area". All we need is
a single fixed-size TLS area for each thread.

Thanks,

Mathieu

>
> Thanks,
> Florian

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

\
 
 \ /
  Last update: 2018-06-11 22:04    [W:0.107 / U:0.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site