Re: [PATCH 02/12] mm/khugepaged: count collapses where khugepaged makes them

From: Baolin Wang

Date: Mon Sep 07 2026 - 03:43:11 EST




On 9/4/26 11:10 PM, Kiryl Shutsemau wrote:
From: "Kiryl Shutsemau (Meta)" <kas@xxxxxxxxxx>

collapse_single_pmd() bumps khugepaged_pages_collapsed for its caller, and
tests cc->is_khugepaged to know whether it should: the counter belongs to
the daemon, and MADV_COLLAPSE must not touch it.

The daemon sees every result of every collapse it asks for, so it can keep
its own counter without the shared path testing who called.

Assisted-by: Claude-Code:claude-opus-5
Signed-off-by: Kiryl Shutsemau (Meta) <kas@xxxxxxxxxx>
---

LGTM.
Reviewed-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>