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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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