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 1E329279DC3 for ; Sat, 7 Feb 2026 10:10:57 +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=1770459058; cv=none; b=K2PcuBBP9E1IZeSINrR0KFrq+omBPKtSfFtTiUp5EP0GZ1R2yZneZjwf6NXPO6Yz6cljFn4+Xw3jV23v//Sqk9nTmkejSZsvxDd1QcE+6SqYqLEzw9fxA3v6CSEHAFun2te2o/84ZH8fT3WTy5DxpnjGWBgw4RcBEA4WMfUfkI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770459058; c=relaxed/simple; bh=8z+9juMjlisTSPIoYQ6L7F4T5SWuaDaHi4XGgO79KzQ=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=GEffTJIOnY5hkBkLlxYNhLdkbCpsoqMhierSMC0t8B/+mtPi1dS1UN/v3acFLW1k8CguoLY436u5gs9DOrTrwnhOp1nXQsal42T6DwwSuaGbAb+7oW0uE0ejEJ3Zxs7B5xzyiMPMgBOIcFvxL7I/k6jXuzRWebLQ7myCGvV5HO4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=sR1RPK3K; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="sR1RPK3K" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2E5CC116D0; Sat, 7 Feb 2026 10:10:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770459057; bh=8z+9juMjlisTSPIoYQ6L7F4T5SWuaDaHi4XGgO79KzQ=; h=Date:From:To:Cc:Subject:From; b=sR1RPK3KrapCvbFc7eKNOpYXMQmiZym+NtUzojvUu5+aBtRDgZup7C6TzfvvnGxfn BUeMTS7LqWIfpBwfW++a+9XfR3TND2fcU0vipDpQPrWj72cS6FxUZA09SqZDC0lxTC 6PfzU+2v75VWEzc4/DGqggXW2g/jeNZ58KC2NpbIKyTzhmBnUA/o2TuntS0x4ikv+y ErDiAZnZrpq3ESY0tGabpnqjEmLf32RAlyxI//m1F+rXlttUZUQrHZ2Ok3GtXbF/A7 8u/h0ov+MT47WtysGloZt8wnPj8rd7wTH7UFZ5CokOqFg9wD/vcXJuPXM9razrP5+G BJ7t7fUtajppw== Date: Sat, 7 Feb 2026 11:10:52 +0100 From: Ingo Molnar To: Linus Torvalds Cc: linux-kernel@vger.kernel.org, Peter Zijlstra , Thomas Gleixner , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Mel Gorman , Tejun Heo , Valentin Schneider , Shrikanth Hegde Subject: [GIT PULL] scheduler fixes Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Linus, Please pull the latest sched/urgent Git tree from: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-2026-02-07 for you to fetch changes up to 4463c7aa11a6e67169ae48c6804968960c4bffea: Miscellaneous MMCID fixes to address bugs and performance regressions in the recent rewrite of the SCHED_MM_CID management code: - Fix livelock triggered by BPF CI testing - Fix hard lockup on weakly ordered systems - Simplify the dropping of CIDs in the exit path by removing an unintended transition phase. - Fix performance/scalability regression on a thread-pool benchmark by optimizing transitional CIDs when scheduling out. [ MERGE NOTE: these changes are bigger than what would be ideal for a late -rc8 merge, but I don't think a good case can be made to delay these fixes. Feel free to overrule. ] Thanks, Ingo ------------------> Thomas Gleixner (4): sched/mmcid: Prevent live lock on task to CPU mode transition sched/mmcid: Protect transition on weakly ordered systems sched/mmcid: Drop per CPU CID immediately when switching to per task mode sched/mmcid: Optimize transitional CIDs when scheduling out include/linux/rseq_types.h | 6 +- kernel/sched/core.c | 184 +++++++++++++++++++++++++++++++-------------- kernel/sched/sched.h | 44 ++++++++--- 3 files changed, 163 insertions(+), 71 deletions(-)