From: Oleg Nesterov <oleg@redhat.com>
To: Breno Leitao <leitao@debian.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
lance.yang@linux.dev, Davidlohr Bueso <dave@stgolabs.net>,
Qian Cai <cai@lca.pw>,
sj@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernel-team@meta.com, stable@vger.kernel.org
Subject: Re: [PATCH v3 1/3] mm/kmemleak: avoid soft lockup when scanning task stacks
Date: Tue, 16 Jun 2026 11:48:25 +0200 [thread overview]
Message-ID: <ajEb6efEx1FexevD@redhat.com> (raw)
In-Reply-To: <20260615-kmemleak-stack-resched-v3-1-acecd7d7fd92@debian.org>
On 06/15, Breno Leitao wrote:
>
> Walk the tasks one PID at a time with find_ge_pid(), taking the RCU read
> lock only to look up and pin each task. The stack is then scanned with no
> lock held, so cond_resched() runs between tasks and the scan stops early
> on scan_should_stop(). This follows the next_tgid()/task_seq_get_next()
> iteration pattern and keeps each RCU critical section short.
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
next prev parent reply other threads:[~2026-06-16 9:48 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-15 17:49 [PATCH v3 0/3] mm/kmemleak: avoid soft lockup when scanning task stacks Breno Leitao
2026-06-15 17:49 ` [PATCH v3 1/3] " Breno Leitao
2026-06-15 18:24 ` Catalin Marinas
2026-06-15 18:46 ` Davidlohr Bueso
2026-06-16 2:31 ` Lance Yang
2026-06-16 9:48 ` Oleg Nesterov [this message]
2026-06-15 17:49 ` [PATCH v3 2/3] mm/kmemleak: stop the task stack scan early when interrupted Breno Leitao
2026-06-15 18:26 ` Catalin Marinas
2026-06-16 9:49 ` Oleg Nesterov
2026-06-15 17:49 ` [PATCH v3 3/3] mm/kmemleak: stop the per-cpu and struct page scans early too Breno Leitao
2026-06-15 18:27 ` Catalin Marinas
2026-06-16 10:07 ` Oleg Nesterov
2026-06-16 12:46 ` Breno Leitao
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