linux-kernel - Re: [PATCH v9 4/7] mm: Change count_objcg_event() to count_objcg

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Message-ID: <20241001002207.GA1349@cmpxchg.org>
Date: Mon, 30 Sep 2024 20:22:07 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, yosryahmed@...gle.com,
	nphamcs@...il.com, chengming.zhou@...ux.dev, usamaarif642@...il.com,
	shakeel.butt@...ux.dev, ryan.roberts@....com, ying.huang@...el.com,
	21cnbao@...il.com, akpm@...ux-foundation.org, willy@...radead.org,
	nanhai.zou@...el.com, wajdi.k.feghali@...el.com,
	vinodh.gopal@...el.com
Subject: Re: [PATCH v9 4/7] mm: Change count_objcg_event() to
 count_objcg_events() for batch event updates.

On Mon, Sep 30, 2024 at 03:12:18PM -0700, Kanchana P Sridhar wrote:
> With the introduction of zswap_store() swapping out large folios,
> we need to efficiently update the objcg's memcg events once per
> successfully stored folio. For instance, the 'ZSWPOUT' event needs
> to be incremented by folio_nr_pages().
> 
> To facilitate this, the existing count_objcg_event() API is modified
> to be count_objcg_events() that additionally accepts a count parameter.
> The only existing calls to count_objcg_event() are in zswap.c - these
> have been modified to call count_objcg_events() with a count of 1.
> 
> Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>

Acked-by: Johannes Weiner <hannes@...xchg.org>