Re: [PATCH v4 0/3] Optimize large folio interaction with deferred split

From: Kirill A. Shutemov
Date: Thu Aug 03 2023 - 08:01:10 EST

On Wed, Aug 02, 2023 at 05:42:23PM +0100, Ryan Roberts wrote:
> - avoid the split lock contention by using mmu gather (suggested by Kirill)


So, my idea is to embed struct deferred_split into struct mmu_gather and
make zap path to use it instead of per-node/per-memcg deferred_split. This
would avoid lock contention. If the list is not empty after zap, move the
to the per-node/per-memcg deferred_split.

But it is only relevant if we see lock contention.

Kiryl Shutsemau / Kirill A. Shutemov