On Wed, Mar 19, 2025 at 03:16:42PM -0400, Johannes Weiner wrote: > On Wed, Mar 19, 2025 at 06:35:02PM +0000, Yosry Ahmed wrote: > > On Wed, Mar 19, 2025 at 02:06:43PM -0400, Johannes Weiner wrote: > > > (btw, why do we not have any locking around the root stats in > > > cgroup_base_stat_cputime_show()? There isn't anything preventing a > > > reader from seeing all zeroes if another reader runs the memset() on > > > cgrp->bstat, is there? Or double times...) > > > > (I think root_cgroup_cputime() operates on a stack allocated bstat, not > > cgrp->bstat) > > That was the case until: > > commit b824766504e49f3fdcbb8c722e70996a78c3636e > Author: Chen Ridong <chenridong@xxxxxxxxxx> > Date: Thu Jul 4 14:01:19 2024 +0000 Nevermind, Tejun pointed me to the follow-up fix he's got already queued up: https://web.git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git/commit/?id=c4af66a95aa3bc1d4f607ebd4eea524fb58946e3 That brings it all back on the stack.
