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Message-ID: <877dyym3r0.fsf@x220.int.ebiederm.org>
Date: Thu, 02 Apr 2020 08:11:31 -0500
From: ebiederm@...ssion.com (Eric W. Biederman)
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jann Horn <jannh@...gle.com>, Alan Stern <stern@...land.harvard.edu>, Andrea Parri <parri.andrea@...il.com>, Will Deacon <will@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Boqun Feng <boqun.feng@...il.com>, Nicholas Piggin <npiggin@...il.com>, David Howells <dhowells@...hat.com>, Jade Alglave <j.alglave@....ac.uk>, Luc Maranget <luc.maranget@...ia.fr>, "Paul E. McKenney" <paulmck@...nel.org>, Akira Yokosawa <akiyks@...il.com>, Daniel Lustig <dlustig@...dia.com>, Adam Zabrocki <pi3@....com.pl>, kernel list <linux-kernel@...r.kernel.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Oleg Nesterov <oleg@...hat.com>, Andy Lutomirski <luto@...capital.net>, Bernd Edlinger <bernd.edlinger@...mail.de>, Kees Cook <keescook@...omium.org>, Andrew Morton <akpm@...ux-foundation.org>, stable <stable@...r.kernel.org>, Marco Elver <elver@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [PATCH] signal: Extend exec_id to 64bits
Linus Torvalds <torvalds@...ux-foundation.org> writes:
> tasklist_lock is aboue the hottest lock there is in all of the kernel.
Do you know code paths you see tasklist_lock being hot?
I am looking at some of the exec/signal/ptrace code paths because they
get subtle corner case wrong like a threaded exec deadlocking when
straced.
If the performance problems are in the same neighbourhood I might be
able to fix those problems while I am in the code.
Eric
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