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 998D134BA39; Tue, 14 Oct 2025 07:47:27 +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=1760428047; cv=none; b=Q+lsfT67YV7Qu1MunZtGHnbPbfxOhB6vSgt4Mpt/ZYDw38O8vlTgxH4TFn5kqzntMbZJv8mvhEB54v4nHrZXzMEmQB2Qikqne+op8ZseOYs4M9BBYimV9vyhszU1gqXdsSqoAEnnojhGUHhEfsw6Mdis9vMAlMQoNRVsI/O0RpQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760428047; c=relaxed/simple; bh=g7JNuJj+OqUGfhgCtCwRpgpvtAkXAEyTRMNNWOnq9pk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ouvdOWOkrCjd/J2EC1fcXaqxh1Nfhur0AeOj1+qLdIvtKOZLqI3wiFNsjMg9wsJcjQ0/8URcIvG7NnYQTzX/Ty7tRJ3onyEUT/ux1GpnTc8ifRMPHWFJzsSrF33IZIstVwpFH5005lbpswbAGY0ggu9tSM2YFLDkujX+ETqLWCE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NjDlrzks; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NjDlrzks" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2B66C4CEE7; Tue, 14 Oct 2025 07:47:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760428047; bh=g7JNuJj+OqUGfhgCtCwRpgpvtAkXAEyTRMNNWOnq9pk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=NjDlrzks3O/M1dbBO/TF/OAv3mURyrpu7ljAxhZ+d/BmpcMeIgk7f9TYHIGzqStgs AuJnsESSt3+RewLb2tzim+qUZWDmk5yCNJIaZYUg7WlBogyoaRVPQ9JPqVIr6K1VSq KAUVAxi4/fkOGuhlL0DSp1HKXleqtJ3ts9VHbjBE= Date: Tue, 14 Oct 2025 09:47:24 +0200 From: Greg Kroah-Hartman To: Sergey Senozhatsky Cc: "Rafael J. Wysocki" , Artem Bityutskiy , Christian Loehle , Sasha Levin , Daniel Lezcano , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Tomasz Figa , stable@vger.kernel.org Subject: Re: stable: commit "cpuidle: menu: Avoid discarding useful information" causes regressions Message-ID: <2025101451-unlinked-strongly-2fb3@gregkh> References: <36iykr223vmcfsoysexug6s274nq2oimcu55ybn6ww4il3g3cv@cohflgdbpnq7> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <36iykr223vmcfsoysexug6s274nq2oimcu55ybn6ww4il3g3cv@cohflgdbpnq7> On Tue, Oct 14, 2025 at 04:43:43PM +0900, Sergey Senozhatsky wrote: > Hello, > > We are observing performance regressions (cpu usage, power > consumption, dropped frames in video playback test, etc.) > after updating to recent stable kernels. We tracked it down > to commit 3cd2aa93674e in linux-6.1.y and commit 3cd2aa93674 > in linux-6.6.y ("cpuidle: menu: Avoid discarding useful information", > upstream commit 85975daeaa4). > > Upstream fixup fa3fa55de0d ("cpuidle: governors: menu: Avoid using > invalid recent intervals data") doesn't address the problems we are > observing. Revert seems to be bringing performance metrics back to > pre-regression levels. > For some reason that commit was not added to the 6.1 releases, sorry about that. Can you submit a working/tested backport so we can queue it up after the next round of releases in a few days? thanks, greg k-h