From: Johannes Weiner <hannes@cmpxchg.org>
To: Nhat Pham <nphamcs@gmail.com>
Cc: akpm@linux-foundation.org, cerasuolodomenico@gmail.com,
yosryahmed@google.com, sjenning@redhat.com, ddstreet@ieee.org,
vitaly.wool@konsulko.com, mhocko@kernel.org,
roman.gushchin@linux.dev, shakeelb@google.com,
muchun.song@linux.dev, chrisl@kernel.org, linux-mm@kvack.org,
kernel-team@meta.com, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, shuah@kernel.org
Subject: Re: [PATCH v7 1/6] list_lru: allows explicit memcg and NUMA node selection
Date: Wed, 29 Nov 2023 10:02:59 -0500 [thread overview]
Message-ID: <20231129150259.GA135852@cmpxchg.org> (raw)
In-Reply-To: <20231127234600.2971029-2-nphamcs@gmail.com>
On Mon, Nov 27, 2023 at 03:45:55PM -0800, Nhat Pham wrote:
> The interface of list_lru is based on the assumption that the list node
> and the data it represents belong to the same allocated on the correct
> node/memcg. While this assumption is valid for existing slab objects LRU
> such as dentries and inodes, it is undocumented, and rather inflexible
> for certain potential list_lru users (such as the upcoming zswap
> shrinker and the THP shrinker). It has caused us a lot of issues during
> our development.
>
> This patch changes list_lru interface so that the caller must explicitly
> specify numa node and memcg when adding and removing objects. The old
> list_lru_add() and list_lru_del() are renamed to list_lru_add_obj() and
> list_lru_del_obj(), respectively.
>
> It also extends the list_lru API with a new function, list_lru_putback,
> which undoes a previous list_lru_isolate call. Unlike list_lru_add, it
> does not increment the LRU node count (as list_lru_isolate does not
> decrement the node count). list_lru_putback also allows for explicit
> memcg and NUMA node selection.
>
> Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Nhat Pham <nphamcs@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
next prev parent reply other threads:[~2023-11-29 15:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-27 23:45 [PATCH v7 0/6] workload-specific and memory pressure-driven zswap writeback Nhat Pham
2023-11-27 23:45 ` [PATCH v7 1/6] list_lru: allows explicit memcg and NUMA node selection Nhat Pham
2023-11-29 15:02 ` Johannes Weiner [this message]
2023-11-27 23:45 ` [PATCH v7 2/6] memcontrol: add a new function to traverse online-only memcg hierarchy Nhat Pham
2023-11-29 15:04 ` Johannes Weiner
2023-11-29 17:00 ` Johannes Weiner
2023-11-27 23:45 ` [PATCH v7 3/6] zswap: make shrinking memcg-aware Nhat Pham
2023-11-29 15:17 ` Johannes Weiner
2023-11-30 0:21 ` Nhat Pham
2023-11-30 1:17 ` Nhat Pham
2023-11-27 23:45 ` [PATCH v7 4/6] mm: memcg: add per-memcg zswap writeback stat Nhat Pham
2023-11-29 15:25 ` Johannes Weiner
2023-11-30 1:26 ` Nhat Pham
2023-11-27 23:45 ` [PATCH v7 5/6] selftests: cgroup: update per-memcg zswap writeback selftest Nhat Pham
2023-11-27 23:46 ` [PATCH v7 6/6] zswap: shrinks zswap pool based on memory pressure Nhat Pham
2023-11-29 16:21 ` Johannes Weiner
2023-11-29 23:44 ` Nhat Pham
2023-12-02 4:44 ` [PATCH v7 0/6] workload-specific and memory pressure-driven zswap writeback Bagas Sanjaya
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