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From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
	 Mike Rapoport <rppt@kernel.org>,
	David Hildenbrand <david@kernel.org>,
	 "Liam R. Howlett" <liam@infradead.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	 Suren Baghdasaryan <surenb@google.com>,
	Michal Hocko <mhocko@suse.com>,
	 Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	 "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	 Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	 Stanislav Fomichev <sdf@fomichev.me>,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	 Hagen Paul Pfeifer <hagen@jauu.net>,
	Pedro Falcato <pfalcato@suse.de>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	 linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org,  Daehyeon Ko <4ncienth@gmail.com>,
	stable@vger.kernel.org
Subject: Re: [PATCH] mm/secretmem: properly account locked pages
Date: Tue, 18 Aug 2026 08:16:19 +0100	[thread overview]
Message-ID: <aoQFsk9GwrZvb7rM@lucifer> (raw)
In-Reply-To: <20260814-secretmem-accounting-v1-1-d2f8c677980b@kernel.org>

To preempt the sashiko stuff, both are false positives:

1. The per-process RLIMIT_MEMLOCK limit is on purpose, it's what you'd expect,
   it matches what io_uring and every other use of the pattern does, and it's
   strictly _more_ limiting as it's per-process limit vs. total inode usage.

2. It doesn't support fallocate so hole-punching isn't an issue. Pseudo-inodes
   are used so you can't drop_caches (which is a privileged operation anyway)
   and secretmem_release() will be called eventually regardless of how things
   are discarded so there's no possibility of an imbalance.

--
Cheers, Lorenzo

      parent reply	other threads:[~2026-08-18  7:16 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-14 18:46 [PATCH] mm/secretmem: properly account locked pages Lorenzo Stoakes (ARM)
2026-08-14 19:10 ` sashiko-bot
2026-08-18  5:20 ` Daehyeon Ko
2026-08-18  7:00   ` Lorenzo Stoakes (ARM)
2026-08-18  7:16 ` Lorenzo Stoakes (ARM) [this message]

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