From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 402991EDA0F for ; Wed, 24 Jun 2026 18:47:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782326822; cv=none; b=og6gjSj9PUHCBr+mmunR3K2BCaVgI7p+5YjQpPXjt06JpTA9NY8xOqKgHS1CS5uyv9gEvZoPJj7/HQrzle0hit2Zxqce9Ew3g9AtNtZhW2MqM7UnYoX2C2DtTS1L7pyAt2S+/6McDdcB2gGWDzeJEcWdYI3DS078YWYHxX9dx0c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782326822; c=relaxed/simple; bh=RHCPB2cfwr26JVMrpwmuQacYgiIlDleSAPmJMpoB+hY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=pUlSX2855OMDa1K0asIzhwn7IfYT9z45uUFsqrV/AHwULfdPmSuTECYUJNi0c8e3IhZ6OEZdwxtgk71+j8Zrd7ktaFI8mgINNi5vOmHUQvU2pPlM8neaNNhjye161j8CF7WsR/06JlquroIMTRp7B96h4ja4qyEvtQsoeBW3954= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cw9Bm5yR; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cw9Bm5yR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A624F1F000E9; Wed, 24 Jun 2026 18:47:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782326820; bh=TGPSCu0g21+TwWetJxPUFLsUPMFw7CRs0Z7g5NF6Lxg=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=cw9Bm5yRuDBOEd0FnNw59PnSfLa4NgZD8hJN6TrPhpfeYKqRTRlBOKLcS4wcj96eZ WvCFXQMuX8x6scRiLUztWZubkU36x3JnUjtNaxUTY3+fyeqj4VR8bd/9RVChGI3tvf SEmdXYq/t1PvwkEp545Vey/8zW3vWOQy0vF/qimWuu6Px89y4vbOdrZdGwtisCFA3m XUVJH95ow5KzXOROFYqYTR/CBOMr+VS0Nf7Uwzm72W/OlLpauQDUG3GN38kGY3ZNkA W+186oumnXN70CKA0e362rAavNOLYA6wrfwFU+N4cLU8mfD8DhlqCaJWN8grr77trS faVa1H26Hd+vA== Date: Wed, 24 Jun 2026 08:46:59 -1000 From: Tejun Heo To: Breno Leitao Cc: Lai Jiangshan , bigeasy@linutronix.de, linux-kernel@vger.kernel.org, marco.crivellari@suse.com, frederic@kernel.org, Hillf Danton , kernel-team@meta.com, kmagar@redhat.com, psuriset@redhat.com, david.dai@linux.dev Subject: Re: [PATCH v4 1/3] workqueue: split kick_pool() into kick_pool_pick() + wake_up_q() Message-ID: References: <20260624-fastwake-v4-0-7b6d7b494a44@debian.org> <20260624-fastwake-v4-1-7b6d7b494a44@debian.org> 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 In-Reply-To: <20260624-fastwake-v4-1-7b6d7b494a44@debian.org> On Wed, Jun 24, 2026 at 04:47:39AM -0700, Breno Leitao wrote: > + wake_q_add(wakeq, p); This is two extra atomic ops for every work item scheduling. This isn't necessarily a deal braker but is this the only way to do this? Can't you just stash the task pointer, extend irq disabled region and wake under rcu protection? Thanks. -- tejun