From: Jakub Kicinski <kuba@kernel•org>
To: "JP Kobryn (Meta)" <jp.kobryn@linux•dev>
Cc: linux-mm@kvack•org, willy@infradead•org, hannes@cmpxchg•org,
akpm@linux-foundation•org, david@kernel•org, ljs@kernel•org,
Liam.Howlett@oracle•com, vbabka@kernel•org, rppt@kernel•org,
surenb@google•com, mhocko@suse•com, kasong@tencent•com,
qi.zheng@linux•dev, shakeel.butt@linux•dev, baohua@kernel•org,
axelrasmussen@google•com, yuanchu@google•com, weixugc@google•com,
riel@surriel•com, edumazet@google•com, netdev@vger•kernel.org,
linux-kernel@vger•kernel.org, kernel-team@meta•com
Subject: Re: [PATCH v2] mm/vmpressure: skip socket pressure for costly order reclaim
Date: Fri, 3 Apr 2026 13:49:50 -0700 [thread overview]
Message-ID: <20260403134950.3af8b4f5@kernel.org> (raw)
In-Reply-To: <20260402232511.17246-1-jp.kobryn@linux.dev>
On Thu, 2 Apr 2026 16:25:11 -0700 JP Kobryn (Meta) wrote:
> When kswapd reclaims at high order due to fragmentation, vmpressure() can
> report poor reclaim efficiency even though the system has plenty of free
> memory. This is because kswapd scans many pages but finds little to reclaim
> - the pages are actively in use and don't need to be freed. The resulting
> scan:reclaim ratio triggers socket pressure, throttling TCP throughput
> unnecessarily.
Acked-by: Jakub Kicinski <kuba@kernel•org>
FWIW
prev parent reply other threads:[~2026-04-03 20:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-02 23:25 [PATCH v2] mm/vmpressure: skip socket pressure for costly order reclaim JP Kobryn (Meta)
2026-04-03 0:45 ` Johannes Weiner
2026-04-03 1:03 ` Shakeel Butt
2026-04-03 1:11 ` Rik van Riel
2026-04-06 17:34 ` JP Kobryn (Meta)
2026-04-03 20:49 ` Jakub Kicinski [this message]
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