From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3790C29D292 for ; Sun, 21 Sep 2025 21:25:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758489909; cv=none; b=l24HJsMBobljMhCll5j9YjCTfHDxyoplUdro6tnEdUtQATLUtZ/LHx2OvGuLsOzBp2Hyv3KR5JwAxXJGbWn3NIyx3CZJwBi8PaCIMb6VxXhPasi4SRWl8oHNuM1zWWVDNGmL1zjt9pESv1/q8ZgRxSmK0hiBCH2jIY3AvydOKS8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758489909; c=relaxed/simple; bh=vFVfjdvEXHMIWbd6lxM25vsqZoEyG6YK+GqfDDpyAzI=; h=Date:To:From:Subject:Message-Id; b=rvSr0tMfe8Hz74U62CEWbty3sX9rR+hMUJ5zEyH0JeHuK6xhJHXtuLKWNong2//Dt5qNfqN6L27+kDfQQLx8NX37zvydnrbhLYRGD/+4YaWM9y8jYSNQLS/tgntLYCTEPqdXOI6c3Ig4sjs5WDtxAZK4iLIg63gESSCs+Vu6uZ8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=MZpW9qJv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="MZpW9qJv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0CD0BC4CEE7; Sun, 21 Sep 2025 21:25:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1758489909; bh=vFVfjdvEXHMIWbd6lxM25vsqZoEyG6YK+GqfDDpyAzI=; h=Date:To:From:Subject:From; b=MZpW9qJvEs+Aug4pQbcqWwdZgEZgcvwIM0zIWxj7mPeIarrimAALE8Gt0cgzaTMkz mCez5et0oL4lQ7V9b9V1vwTbuBcbWAlIkvbbXIye8x9vK+9OyVYFUSqEBL0cC7NdQC YNrGVQs4pOV7gKUq4o341Mz+TetQ777b7yvt2UFs= Date: Sun, 21 Sep 2025 14:25:08 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vishal.moola@gmail.com,vbabka@suse.cz,usamaarif642@gmail.com,surenb@google.com,shakeel.butt@linux.dev,mhocko@suse.com,jackmanb@google.com,hannes@cmpxchg.org,pyyjason@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-show_mem-add-trylock-while-printing-alloc-info.patch removed from -mm tree Message-Id: <20250921212509.0CD0BC4CEE7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/show_mem: add trylock while printing alloc info has been removed from the -mm tree. Its filename was mm-show_mem-add-trylock-while-printing-alloc-info.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Yueyang Pan Subject: mm/show_mem: add trylock while printing alloc info Date: Wed, 3 Sep 2025 04:16:14 -0700 In production, show_mem() can be called concurrently from two different entities, for example one from oom_kill_process() another from __alloc_pages_slowpath from another kthread. This patch adds a spinlock and invokes trylock before printing out the kernel alloc info in show_mem(). This way two alloc info won't interleave with each other, which then makes parsing easier. Link: https://lkml.kernel.org/r/4ed91296e0c595d945a38458f7a8d9611b0c1e52.1756897825.git.pyyjason@gmail.com Signed-off-by: Yueyang Pan Acked-by: Usama Arif Acked-by: Vlastimil Babka Acked-by: Zi Yan Acked-by: Suren Baghdasaryan Acked-by: Shakeel Butt Cc: Brendan Jackman Cc: Johannes Weiner Cc: Michal Hocko Cc: Vishal Moola (Oracle) Signed-off-by: Andrew Morton --- mm/show_mem.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/mm/show_mem.c~mm-show_mem-add-trylock-while-printing-alloc-info +++ a/mm/show_mem.c @@ -425,7 +425,9 @@ void __show_mem(unsigned int filter, nod printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages)); #endif #ifdef CONFIG_MEM_ALLOC_PROFILING - { + static DEFINE_SPINLOCK(mem_alloc_profiling_spinlock); + + if (spin_trylock(&mem_alloc_profiling_spinlock)) { struct codetag_bytes tags[10]; size_t i, nr; @@ -452,6 +454,7 @@ void __show_mem(unsigned int filter, nod ct->lineno, ct->function); } } + spin_unlock(&mem_alloc_profiling_spinlock); } #endif } _ Patches currently in -mm which might be from pyyjason@gmail.com are