From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.125 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794703799; b=oFjg7xpgeUhw6UoNdlV+79Isz1xikWGPElw/I/OXJLB1OAtFgfvpJk6Jd9yeVcnLzAqG D/BCRDwxkC1cfe0aIs70veJnK5k4HQwjOqbr+sYPBX31z5rL4wYpj4wfDIMF5J8SheWP8 HegC6eekhNKDlyz1HC+KR6ZIxU0N9GsuFcl+E/vaP3NpLWW3d1WemwvlIC4B2IjGTDQ34 8qUZIcPph1yJyMa0Jp0jNw/P8nA//2tUrCjGkq9YN1JCanTKnY/MxzS77JAoX1O2kfuPW GFZBHt/WUquNrEKJlU6R7HFW+u4DJx7TmRf0aUqzByiH+ILTbqw0Ij5gI+r3LNTf6QQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794703799; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:Date:From:To:CC:Subject:In-Reply-To: Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding; bh=8HhBoJ0oLDIkG/m3q7iXHnaJgleISQvg2LeUm5lbyGk=; b=vwSFOhW30d9Ab+New7ntv29ic/J3/8wbI7UnmxZbC1DDMeXCn+hr6/bAecFdHQyIx8FZ Fk9Y1q5ZMMm0sNzKM/m5POJVV0SnaOamVLZ+R52+nzU7xiW5axdnvTVSehWN59zjF0qXP h+vtLYHw3GxSi1LAH1hq566a/WSornAVHwRUYKt6ILSH8ddguFBssWo3VBlV/2CQ8SV6n 5Q6NTzvtdxS3XVtqSHJqR/u1JB5AELJF1tdy7+cfKfZw8t/OkZia99vAud1e+aCsupDu0 KrsQp8tY2qpjxSYwxoXi/i3uyQ69HINniuYf+QiVHXuQ9LlgheTefq5h4FLvSFD1KbQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=ZmF3OfR+; arc=none smtp.remote-ip=91.218.175.125 Received: from mta0.migadu.com (out-125.mta0.migadu.com [91.218.175.125]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95CB0606A327 for ; Sun, 15 Nov 2026 00:49:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 95CB0606A327 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=ZmF3OfR+ X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=NSiCSGoCCyJBHjU2+fpDRU4Sn+QKieajStYeP4irVHU=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794703795; v=1; x=1795308595; b=ZmF3OfR+T9xDVYyAft+FWe6oOImWbibsMqMV6h+4agbLfP/ZYcqkUWE60f5/I1pjL01Zatp6 rU2DP5nj4VLsddMm0imPHyUoV2tfEXS1bi4a9emY+zGTNScuQJKazJv+1EXKBXWiaDFRKNYR3Ge 47A80tS80tUqsjkYFfCsP+ik= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id a0b98ee2d4f930d1; Sun, 15 Nov 2026 00:49:55 +0000 X-Mizu-Trace-ID: a0b98ee2d4f930d1 X-Migadu-Flow: FLOW_OUT Date: Sun, 15 Nov 2026 00:49:54 +0000 From: Bradley Morgan To: wusamuel@google.com CC: kernel-team@android.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, pavel@kernel.org, rafael@kernel.org Subject: =?US-ASCII?Q?Re=3A_=5BPATCH=5D_freezer=3A_Check_frozen=28=29?= =?US-ASCII?Q?_before_freezing=28=29_in_freeze=5Ftask=28=29?= In-Reply-To: <20261115003113.1852160-2-wusamuel@google.com> Message-ID: <09C404BB-5914-4658-801E-4DADD3411CF2@linux.dev> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit On 15 November 2026 00:31:14 GMT, Samuel Wu wrote: >During the freeze stage of suspend, there are multiple passes over the >same list of tasks. Each pass tries to freeze non-frozen tasks, meaning >that the number of frozen tasks increase monotonically, and that each >subsequent pass will mostly be iterating over frozen tasks. Therefore, >it is faster to *first* check that a task is frozen before other checks, >especially since the frozen check is computationally trivial. > >Check frozen(p) before !freezing(p) to short circuit the more expensive >freezing_slow_path() calls, while retaining identical return semantics. > >On a v7.3 Pixel 9 device, this consistently reduces freeze_processes >latency by ~10% (~4.5 ms). 7.3 PIXEL 9??? WHAT HOW? THE BASE ON STOCK IS 6.12!!!! WOW! (Please do for pixel 7, I want flair :c) > >Signed-off-by: Samuel Wu >--- > kernel/freezer.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > >diff --git a/kernel/freezer.c b/kernel/freezer.c >index a76bf957fb32..1adf09321389 100644 >--- a/kernel/freezer.c >+++ b/kernel/freezer.c >@@ -166,7 +166,7 @@ bool freeze_task(struct task_struct *p) > unsigned long flags; > > spin_lock_irqsave(&freezer_lock, flags); >- if (!freezing(p) || frozen(p) || __freeze_task(p)) { >+ if (frozen(p) || !freezing(p) || __freeze_task(p)) { > spin_unlock_irqrestore(&freezer_lock, flags); > return false; > } Good good. Reviewed-by: Bradley Morgan > --- Thanks!