lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Mon, 7 Dec 2020 19:53:14 -0800 From: Davidlohr Bueso <dave@...olabs.net> To: Waiman Long <longman@...hat.com> Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org, Phil Auld <pauld@...hat.com> Subject: Re: [PATCH 3/5] locking/rwsem: Enable reader optimistic lock stealing On Tue, 17 Nov 2020, Waiman Long wrote: >If the optimistic spinning queue is empty and the rwsem does not have >the handoff or write-lock bits set, it is actually not necessary to >call rwsem_optimistic_spin() to spin on it. Instead, it can steal the >lock directly as its reader bias is in the count already. If it is >the first reader in this state, it will try to wake up other readers >in the wait queue. > >Signed-off-by: Waiman Long <longman@...hat.com> Reviewed-by: Davidlohr Bueso <dbueso@...e.de>
Powered by blists - more mailing lists