From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793967823; b=cqVj76jTtSBPyWVqHHjEgPfgYzzWCNY3Iy39EPKZvN4eVuCIvwTS7DPhobP0bqTXK2nv wpOHKRk6HrOikBWvuvMS4z7T3cFk9jVI75vgbf1+ZUPFFKxb0ZeEpMxmLaWwJlwAiMtkb dA4vZeHnosyqWMkKDXmB5OeN4SRZvw0CD+dru20qBbPIkO+NAg9hYNgiv0urLOR3AdeqI hVTg2AkEaqcY7ltoUysHVSRZJlRifXzrrxPVBJ14B99qpaRqTjsOP9zOl40I9KTl5QiDV MzBBaeiNyeIEc2GK+jfBoyzcTVNRu4noLR0q+INYXXX0/1lsaAnN7+HSQXI+KiRMh7w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793967823; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=xLjGM2UfwmU67W0l87AptAXAx/R+n7IKoR/u/mXJKpg=; b=uzRSnw8uNAHwaCO6bkNCjP0Cdvwm+m68kEuf+aUqUA2nK2jqUTzIhGh756NoKKpasr9+ XjojkoF6uBOgyFASB2xtdy3D0icHht28Wk33mivt+MuGFTpxrsno3kO7MD9HYYMlHfCcR mLLYGgtPglxpI7E49F3z1yjen+Dg8snWMAFP5/WNQsv7eK37C2wdYvdwg6ymJkTeaJAuK evBdhzQon33x1RwxDw86b4gz0Ad8/0qc0z3rQ2gprVSmGmuvx91MCoTAgvtkOk7ocsN4o TrlEu2XVVabyX1DQ4URS9Wg7J4F7ADk7WplZPMR12E1qp0IWT3ESrBmnVVh4YH4Rw+g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b="L0/p3SHz"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB31A606A326 for ; Fri, 6 Nov 2026 12:23:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=L0/p3SHz Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B8181F0089F; Fri, 6 Nov 2026 12:23:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793967823; bh=xLjGM2UfwmU67W0l87AptAXAx/R+n7IKoR/u/mXJKpg=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=L0/p3SHznilxSDO7OgzJM7rwJVgmsnj//HpVD5hDrikLDqFEazTyfc8l5n7oVdoiZ QWqfdk8UdMTE2CQJ0nNUuF8ihSuQ9UGqu9MpGCGBthQgERbzl6GlodrEvMp789U6Tq IGyMCBX3rfBGZ+ewCHoHjhVKJjGtgDTztZBs5ViGhWmx6fLHcd694D4KgLYgywOnLE pLwPhu20b9BywaahSTEmmDCVbSZ2j4G1i8tof4OEFeXpOem6F/1IYAAveAiUX/edng bmyP8tHh1UqgyuqVmpL0Hji09IzIMoialiDNggEd9ZhkEgm5n0za/LmJPskyy90Wbp KYS7Q+S8hhQ+A== Date: Fri, 6 Nov 2026 12:23:37 +0000 From: "Lorenzo Stoakes (ARM)" To: David Hildenbrand , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 3/3] mm/khugepaged: release contended mmap read lock after scanning enough VMAs Message-ID: References: <20261105-khugepaged-latency-fix-v2-0-4384bbfe4606@kernel.org> <20261105-khugepaged-latency-fix-v2-3-4384bbfe4606@kernel.org> 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=us-ascii Content-Disposition: inline In-Reply-To: On Fri, Nov 06, 2026 at 12:07:53PM +0000, Lorenzo Stoakes (ARM) wrote: > On reflection, I think this would be better implemented as something like: > > static void collapse_scan_mm_slot(unsigned int progress_max, ...) > { > unsigned int long lock_start = jiffies; The rare unsigned int long type, rarely deployed but super effective when it is :P (sorry losing my mind, should be an unsigned long) -- Cheers, Lorenzo