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[46.193.66.10]) by smtp.gmail.com with ESMTPSA id w9sm25604173wmi.0.2019.04.23.23.21.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 23 Apr 2019 23:21:37 -0700 (PDT) From: Andreas Dilger Message-Id: Content-Type: multipart/signed; boundary="Apple-Mail=_D176D8A4-852F-4A5B-BEA3-8D4911BAAF0A"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: [PATCH v2] ext4: cond_resched in work-heavy group loops Date: Wed, 24 Apr 2019 08:21:36 +0200 In-Reply-To: <20190423211329.149642-1-khazhy@google.com> Cc: Theodore Ts'o , linux-ext4 , open list , Jan Kara To: Khazhismel Kumykov References: <20190423211329.149642-1-khazhy@google.com> X-Mailer: Apple Mail (2.3273) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --Apple-Mail=_D176D8A4-852F-4A5B-BEA3-8D4911BAAF0A Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On Apr 23, 2019, at 11:13 PM, Khazhismel Kumykov = wrote: >=20 > These functions may take a long time looping over many groups, which > may cause issues for non-preempt kernels. > ext4_mb_init_backend() > ext4_setup_system_zone() > ext4_mb_release() >=20 > Signed-off-by: Khazhismel Kumykov Reviewed-by: Andreas Dilger > --- > v2: > - a few other places that in testing showed to be slow >=20 > fs/ext4/block_validity.c | 1 + > fs/ext4/mballoc.c | 2 ++ > 2 files changed, 3 insertions(+) >=20 > diff --git a/fs/ext4/block_validity.c b/fs/ext4/block_validity.c > index 913061c0de1b..16134469ea3c 100644 > --- a/fs/ext4/block_validity.c > +++ b/fs/ext4/block_validity.c > @@ -155,6 +155,7 @@ int ext4_setup_system_zone(struct super_block *sb) > return 0; >=20 > for (i=3D0; i < ngroups; i++) { > + cond_resched(); > if (ext4_bg_has_super(sb, i) && > ((i < 5) || ((i % flex_size) =3D=3D 0))) > add_system_zone(sbi, = ext4_group_first_block_no(sb, i), > diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c > index 8ef5f12bbee2..99ba720dbb7a 100644 > --- a/fs/ext4/mballoc.c > +++ b/fs/ext4/mballoc.c > @@ -2490,6 +2490,7 @@ static int ext4_mb_init_backend(struct = super_block *sb) > sbi->s_buddy_cache->i_ino =3D EXT4_BAD_INO; > EXT4_I(sbi->s_buddy_cache)->i_disksize =3D 0; > for (i =3D 0; i < ngroups; i++) { > + cond_resched(); > desc =3D ext4_get_group_desc(sb, i, NULL); > if (desc =3D=3D NULL) { > ext4_msg(sb, KERN_ERR, "can't read descriptor = %u", i); > @@ -2705,6 +2706,7 @@ int ext4_mb_release(struct super_block *sb) >=20 > if (sbi->s_group_info) { > for (i =3D 0; i < ngroups; i++) { > + cond_resched(); > grinfo =3D ext4_get_group_info(sb, i); > #ifdef DOUBLE_CHECK > kfree(grinfo->bb_bitmap); > -- > 2.21.0.593.g511ec345e18-goog >=20 Cheers, Andreas --Apple-Mail=_D176D8A4-852F-4A5B-BEA3-8D4911BAAF0A Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIzBAEBCAAdFiEEDb73u6ZejP5ZMprvcqXauRfMH+AFAlzAAHAACgkQcqXauRfM H+AJjQ//egWnCTo2jiw4DtSAWlxwng0FavawWfmuKUmPGmxIBHmw/JM/m86f0JuB t5SpFCEdHBB7uX3KoxPF6ZF/dbrnToHmv7FGMkb/wBoefxHtbwyBD4UWeZL7ZZ0x mc17+lEBXsUUOMXJuxr4r+8sZkn9FA+KB51Gmd0NN9R7hinY9Eia1BkDza5MYFf4 Hf/ibSpCCPV5pvSdB0mumTSOYW0bcLXX0Jdz33/Qked7+rgaI8kRgdywFa1cQeGl +BemfwrGuoT9sOM/pxRxIdnUWARo06Of3RShA9PVA7kurVIwe8yV5gy2dUh1WUuL FAA2VROXnG7Q1FbAKRSLZbpKyqiGBuJn6wCa9b1/z7zGUYw+T5kIlkOEULpLEM6q 4eufuucMkBWGewNa1PsI+ZKEqfJKhGoBOQj2/114hWdv4ONBbx/VXlNdc2DqIG/Z fHb+/EvhRIwxYQwYKLB14SdcRTXchBU6F2LTQ2VOB14jBdZQYksSE+KmfZY5Mf/c Wlzy1OvgT3CrKL4Hk99qtSM1iLF787nQue24+Ig0xyGGLZGJKPBqoebZ4/iDUm1g mXeHRWkSOiUk5gKZzGvVHHi5UM1RK8tTL39xwOEcjSKdtEJ32hRJSh7FwgfE7E7r CEFGOKE57oZu0gFJnzddf2DFHds1O9hMky3n7OV1CCFYVgoCrsk= =+WoV -----END PGP SIGNATURE----- --Apple-Mail=_D176D8A4-852F-4A5B-BEA3-8D4911BAAF0A--