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 E59D416DC11 for ; Wed, 21 Aug 2024 19:42:43 +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=1724269364; cv=none; b=gQoHp2xxCNSzapp28D21PI7gTm9lE1Pv3wbn8yLQnQMIaDvH/NGVsDRfeHjFpRc6sYDW9t9qxV+br1ZPu3t/6qEZ8CyCxIShA2gzCAQJkT3uWc7xzk4/QXfV3ksKkDlhrGvrqlmBUGyQ1sMfuvv5Rx2eSdjK7yIw+86M9lj6yE8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724269364; c=relaxed/simple; bh=ecQgf81mI2iGpBoXkQT7nsNpaMAqA3gQdBY/bSFIK1Q=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=hOetbMfsUa/k/drTzScH/yuu/UVcCcj5oJ0ETrvFwFSYAWjdLZwPawI5L/aI/E17JBgMqlnyZ/uGDxoAiaCoXDaf/b3A6wMC/Pzjo/855tuy7GrxfEkHQfEHlhSxyx2zNtzQJnPQKLqVl4ClSXLwFhEZPReDmefCZvYS6uIFAkA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=SNkYKVh3; 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="SNkYKVh3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A67D4C32781; Wed, 21 Aug 2024 19:42:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724269363; bh=ecQgf81mI2iGpBoXkQT7nsNpaMAqA3gQdBY/bSFIK1Q=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=SNkYKVh3Eyh0uA6cdYvrrBGPLjTR4vYw0fPs9eNtVRWguZnpU1oeC7WMHCqXcgO6s pKz91SadyR1Pr6KJujUY/G5flhHpQeol8tZCjB/nlGNeeemceAp9Pf8FSBciOMmyWu OKaO1ymAs3dt9l9Jm5XTUtOvqlMthbJzzh0dPiajZSpNDDIB1pVtKk1pgPpCdzGvXD P0efnGy++hB/rigzjPjVZ6/Fvk3EVHKWGc94LAX7mpr1PnE5urUX9nK+byH9bkipHx 2rK5o7FOcQYz97oEXW1E/mPkN+qBFqOYMG1PR+NfJhoyfoA97c+YhR9lHcicZdNrAs MSEEI3NKeg4SA== Message-ID: <5d1e3147349749a374c2a412efeb22e2754aa834.camel@kernel.org> Subject: Re: [PATCH RFC v2 0/6] inode: turn i_state into u32 From: Jeff Layton To: Christian Brauner , Linus Torvalds Cc: NeilBrown , Peter Zijlstra , Ingo Molnar , Jan Kara , linux-fsdevel@vger.kernel.org Date: Wed, 21 Aug 2024 15:42:41 -0400 In-Reply-To: <20240821-work-i_state-v2-0-67244769f102@kernel.org> References: <20240821-work-i_state-v2-0-67244769f102@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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first time I managed to send out my personal wip branch. > So for the record: The intention is to send what's in work.i_state on > vfs/vfs.git. >=20 > --- > I've recently looked for some free space in struct inode again > because > of some exec kerfuffle we recently had and while my idea didn't turn > into anything I noticed that we often waste bytes when using wait bit > operations. So I set out to switch that to another mechanism that > would > allow us to free up bytes. So this is an attempt to turn i_state from > an unsigned long into an u32 using the individual bytes of i_state as > addresses for the wait var event mechanism (Thanks to Linus for that > idea.). >=20 > This survives LTP, xfstests on various filesystems, and will-it- > scale. >=20 > To: Linus Torvalds > Cc: NeilBrown > Cc: Peter Zijlstra > Cc: Ingo Molnar > Cc: Jeff Layton > Cc: Jan Kara > Cc: Christian Brauner > Cc: linux-fsdevel@vger.kernel.org > Signed-off-by: Christian Brauner >=20 > --- > Changes in v2: > - Actually send out the correct branch. > - Link to v1: > https://lore.kernel.org/r/20240816-vfs-misc-dio-v1-1-80fe21a2c710@kernel.= org >=20 > --- >=20 >=20 >=20 > --- > base-commit: 01e603fb789c75b3a0c63bddd42a42a710da7a52 > change-id: 20240820-work-i_state-4e34db39bcf8 >=20 This all looks good to me, modulo one minor nit in patch #5 that you can take or leave. Reviewed-by: Jeff Layton