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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=at1Y7I+af8DowHuuB+q7l9RltrFaqIV6FTcFuGNWudFdFpHoZh8YbAxlcKM3OICdE uBFiBV0dAyTlY4/scGH4rEZbbNagbZrrQq35tpNi0rA4HYLuDR9incSHuOiUXypEpa EyiiAoxolA00H4b3svQV4O75gwTw4jBHwJu/W7Rc= Date: Sat, 27 Jun 2026 14:41:41 +0100 From: Catalin Marinas To: Breno Leitao Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, oleg@redhat.com, kernel-team@meta.com Subject: Re: [PATCH] mm/kmemleak: skip the remaining scan phases when interrupted Message-ID: References: <20260626-kmemleak_improve-v1-1-d40c7616f64f@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260626-kmemleak_improve-v1-1-d40c7616f64f@debian.org> X-Rspamd-Queue-Id: D209216000C X-Stat-Signature: 4uqeenaw4m3jcnt7kcs7wat7rhhyc7sf X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1782567705-903223 X-HE-Meta: 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 DS40RfEj RtYQI3tJo/G2P6y9VKQLwp/vTVoTsMKeNxhII9fe45OVLUZEQEhtw7ak8t4U7pyTHKvvyugFy18pBkv8K1MCjrZaV10JCR5BFp6K8CdS94Fj/n8rNOtpELGIpxpejUK9wABJ+XAnXluWIqVVmIOS0TM1nZai852qGFeVBMyS/lM3bf9FFqqXGjwhbBUt6Ty8MRjqf4rCH2RHQbbfRQhD8tYxlmDYGJKRsdb0i6f84AntB0GIL5d5seqJ9X2HcTLuC7kRuQ+bWYB7W523JkJl5ixwDvP31goZz+0mrdjrVdDoLCGH2cUQE5bOfRUfza24CG1sf7bQVfUgw6tQ= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jun 26, 2026 at 10:56:23AM -0700, Breno Leitao wrote: > kmemleak_scan() scans the per-cpu sections, the struct page ranges and > the task stacks in sequence. Each loop now bails out once scan_block() > reports the scan was interrupted, but the later phases are still entered > and only bail on their first scan_block() call. > > Jump straight to the gray list scan once a phase reports an interrupted > scan, so the remaining scan phases are not entered at all. This does not > change the scan results, it only avoids the pointless re-entry. > > Suggested-by: Oleg Nesterov > Signed-off-by: Breno Leitao Reviewed-by: Catalin Marinas