From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from zeniv.linux.org.uk (zeniv.linux.org.uk [62.89.141.173]) (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 D8D5A1AE01D; Mon, 18 Nov 2024 15:44:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.89.141.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731944664; cv=none; b=HFFUeghJI0fy9mFyDAIoNqKpXIQ0dcTRpv7JWhB0mhtl2f18f3G+JvCwYB2hh831M3NThBBDecRBPG4yJ8vJPH1OcrfPbL5JOrVX+fA9zWyKv9eBc4nXGO6+mEL+NTIdR23PD8CmxwaGphGhjeNRw9QefRKs0xYBSiJ+ll/eaiA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731944664; c=relaxed/simple; bh=1S4kc4XaVfOflWXcjf8x0Za3BP+BFQ/ELMboQd8SWlM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=GZSQcXkDdjF8cJLN4uzoosvyy6wiUmB6dejEV4DvzIr2WNM+y8nbV1ArfpMXveLaP6FClGcG/Q8w0PfaUhUeOEtN9mYpSNotBg00+eTUWlHhrLV0BmXItthFNkz6A/7vtmvee13nY2akA9n7QMQ0wguI0xl/rg8hu1+N0FIwGAw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk; spf=none smtp.mailfrom=ftp.linux.org.uk; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b=YwGR+Ap4; arc=none smtp.client-ip=62.89.141.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zeniv.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=ftp.linux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linux.org.uk header.i=@linux.org.uk header.b="YwGR+Ap4" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=linux.org.uk; s=zeniv-20220401; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=U4YplOiZXPPZzPsqHuvWsfd3v86LFROZH/s6gwRNhlk=; b=YwGR+Ap41VqK4Cym6epNZe/X7h fj2/Qm0QkK7vvVuE0fRLDNKSvm1JZfU8SXfhb/+kQJjvPeAgMtRJA9Ws6jcuduvW+KDZszAktYDUL uUCgOiQplQU4y+ijQwQYPxseMIACNqgr1mIlsI+CTTO9w8594Jjz0KQohzt0uch9o+wjQrfrVy8Sq rhdJvNmYElDJnzjfFQkRwFkQIDHXIXy4L9iehy2dEP0/vJcs18DDtxVrTUgMwRSCkEWBz4NIj0d9o neHZ4w30kjfrCuGSIUd/X2ZWhNPTxvO92aa3n0TCx6LTBQbmXGNl+NHS3CSMycI67IgBVtYkbfymh XRPISbRQ==; Received: from viro by zeniv.linux.org.uk with local (Exim 4.98 #2 (Red Hat Linux)) id 1tD3vG-0000000GQWu-3ewp; Mon, 18 Nov 2024 15:44:18 +0000 Date: Mon, 18 Nov 2024 15:44:18 +0000 From: Al Viro To: Mateusz Guzik Cc: Jan Kara , brauner@kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [RFC PATCH] vfs: dodge strlen() in vfs_readlink() when ->i_link is populated Message-ID: <20241118154418.GH3387508@ZenIV> References: <20241118085357.494178-1-mjguzik@gmail.com> <20241118115359.mzzx3avongvfqaha@quack3> <20241118144104.wjoxtdumjr4xaxcv@quack3> 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: Sender: Al Viro On Mon, Nov 18, 2024 at 03:51:34PM +0100, Mateusz Guzik wrote: > This is only 1.5% because of other weird slowdowns which don't need to > be there, notably putname using atomics. If the other crap was already > fixed it would be closer to 5%. Describe your plans re putname(), please. Because we are pretty much certain to step on each other's toes here in the coming cycle.