On Thu, Sep 24, 2020 at 09:51:43AM -0400, Mathieu Desnoyers wrote: > > > ----- On Sep 23, 2020, at 7:36 PM, Peter Oskolkov posk@xxxxxxxxxx wrote: > > > This patchset is based on Google-internal RSEQ > > work done by Paul Turner and Andrew Hunter. > > > > When working with per-CPU RSEQ-based memory allocations, > > it is sometimes important to make sure that a global > > memory location is no longer accessed from RSEQ critical > > sections. For example, there can be two per-CPU lists, > > one is "active" and accessed per-CPU, while another one > > is inactive and worked on asynchronously "off CPU" (e.g. > > garbage collection is performed). Then at some point > > the two lists are swapped, and a fast RCU-like mechanism > > is required to make sure that the previously active > > list is no longer accessed. > > > > This patch introduces such a mechanism: in short, > > membarrier() syscall issues an IPI to a CPU, restarting > > a potentially active RSEQ critical section on the CPU. > > > > Acked-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> Thanks!, I've queued them in: git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/core please double check the Subject/Changelog edits I made. Once all the robots are green, I'll push out the lot to -tip.
