linux-kernel - Re: [PATCH v2 01/14] mm: memcg: introduce memcontrol-v1.c

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Date: Tue, 25 Jun 2024 09:05:29 +0200
From: Michal Hocko <mhocko@...e.com>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 01/14] mm: memcg: introduce memcontrol-v1.c

On Mon 24-06-24 17:58:53, Roman Gushchin wrote:
> This patch introduces the mm/memcontrol-v1.c source file which will be used for
> all legacy (cgroup v1) memory cgroup code. It also introduces mm/memcontrol-v1.h
> to keep declarations shared between mm/memcontrol.c and mm/memcontrol-v1.c.
> 
> As of now, let's compile it if CONFIG_MEMCG is set, similar to mm/memcontrol.c.
> Later on it can be switched to use a separate config option, so that the legacy
> code won't be compiled if not required.

I do not feel strongly about that but wouldn't having the new config
here already make it easier to test?

> Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>

Anyway
Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/Makefile        | 3 ++-
>  mm/memcontrol-v1.c | 3 +++
>  mm/memcontrol-v1.h | 7 +++++++
>  3 files changed, 12 insertions(+), 1 deletion(-)
>  create mode 100644 mm/memcontrol-v1.c
>  create mode 100644 mm/memcontrol-v1.h
> 
> diff --git a/mm/Makefile b/mm/Makefile
> index 8fb85acda1b1..124d4dea2035 100644
> --- a/mm/Makefile
> +++ b/mm/Makefile
> @@ -26,6 +26,7 @@ KCOV_INSTRUMENT_page_alloc.o := n
>  KCOV_INSTRUMENT_debug-pagealloc.o := n
>  KCOV_INSTRUMENT_kmemleak.o := n
>  KCOV_INSTRUMENT_memcontrol.o := n
> +KCOV_INSTRUMENT_memcontrol-v1.o := n
>  KCOV_INSTRUMENT_mmzone.o := n
>  KCOV_INSTRUMENT_vmstat.o := n
>  KCOV_INSTRUMENT_failslab.o := n
> @@ -95,7 +96,7 @@ obj-$(CONFIG_NUMA) += memory-tiers.o
>  obj-$(CONFIG_DEVICE_MIGRATION) += migrate_device.o
>  obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o khugepaged.o
>  obj-$(CONFIG_PAGE_COUNTER) += page_counter.o
> -obj-$(CONFIG_MEMCG) += memcontrol.o vmpressure.o
> +obj-$(CONFIG_MEMCG) += memcontrol.o memcontrol-v1.o vmpressure.o
>  ifdef CONFIG_SWAP
>  obj-$(CONFIG_MEMCG) += swap_cgroup.o
>  endif
> diff --git a/mm/memcontrol-v1.c b/mm/memcontrol-v1.c
> new file mode 100644
> index 000000000000..a941446ba575
> --- /dev/null
> +++ b/mm/memcontrol-v1.c
> @@ -0,0 +1,3 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +
> +#include "memcontrol-v1.h"
> diff --git a/mm/memcontrol-v1.h b/mm/memcontrol-v1.h
> new file mode 100644
> index 000000000000..7c5f094755ff
> --- /dev/null
> +++ b/mm/memcontrol-v1.h
> @@ -0,0 +1,7 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +
> +#ifndef __MM_MEMCONTROL_V1_H
> +#define __MM_MEMCONTROL_V1_H
> +
> +
> +#endif	/* __MM_MEMCONTROL_V1_H */
> -- 
> 2.45.2

-- 
Michal Hocko
SUSE Labs