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Date: Thu, 02 Apr 2020 08:11:31 -0500
From: (Eric W. Biederman)
To: Linus Torvalds <>
Cc: Jann Horn <>,  Alan Stern <>,  Andrea Parri <>,  Will Deacon <>,  Peter Zijlstra <>,  Boqun Feng <>,  Nicholas Piggin <>,  David Howells <>,  Jade Alglave <>,  Luc Maranget <>,  "Paul E. McKenney" <>,  Akira Yokosawa <>,  Daniel Lustig <>,  Adam Zabrocki <>,  kernel list <>,  Kernel Hardening <>,  Oleg Nesterov <>,  Andy Lutomirski <>,  Bernd Edlinger <>,  Kees Cook <>,  Andrew Morton <>,  stable <>,  Marco Elver <>,  Dmitry Vyukov <>,  kasan-dev <>
Subject: Re: [PATCH] signal: Extend exec_id to 64bits

Linus Torvalds <> 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

If the performance problems are in the same neighbourhood I might be
able to fix those problems while I am in the code.


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