diff options
Diffstat (limited to 'kernels/linux-libre-xen')
3 files changed, 197 insertions, 3 deletions
diff --git a/kernels/linux-libre-xen/0001-block-loop-convert-to-per-device-workqueue.patch b/kernels/linux-libre-xen/0001-block-loop-convert-to-per-device-workqueue.patch new file mode 100644 index 000000000..3b426c7b4 --- /dev/null +++ b/kernels/linux-libre-xen/0001-block-loop-convert-to-per-device-workqueue.patch @@ -0,0 +1,133 @@ +From ebcacf05168d9791d39c5434164c64b9ef937171 Mon Sep 17 00:00:00 2001 +From: Ming Lei <ming.lei@canonical.com> +Date: Tue, 5 May 2015 19:49:54 +0800 +Subject: [PATCH 1/2] block: loop: convert to per-device workqueue + +Documentation/workqueue.txt: + If there is dependency among multiple work items used + during memory reclaim, they should be queued to separate + wq each with WQ_MEM_RECLAIM. + +Loop devices can be stacked, so we have to convert to per-device +workqueue. One example is Fedora live CD. + +Fixes: b5dd2f6047ca108001328aac0e8588edd15f1778 +Cc: stable@vger.kernel.org (v4.0) +Cc: Justin M. Forbes <jforbes@fedoraproject.org> +Signed-off-by: Ming Lei <ming.lei@canonical.com> +Acked-by: Tejun Heo <tj@kernel.org> +Signed-off-by: Jens Axboe <axboe@fb.com> +--- + drivers/block/loop.c | 30 ++++++++++++++---------------- + drivers/block/loop.h | 1 + + 2 files changed, 15 insertions(+), 16 deletions(-) + +diff --git a/drivers/block/loop.c b/drivers/block/loop.c +index d1f168b..fec06d5 100644 +--- a/drivers/block/loop.c ++++ b/drivers/block/loop.c +@@ -85,8 +85,6 @@ static DEFINE_MUTEX(loop_index_mutex); + static int max_part; + static int part_shift; + +-static struct workqueue_struct *loop_wq; +- + /* + * Transfer functions + */ +@@ -777,6 +775,12 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, + size = get_loop_size(lo, file); + if ((loff_t)(sector_t)size != size) + goto out_putf; ++ error = -ENOMEM; ++ lo->wq = alloc_workqueue("kloopd%d", ++ WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 0, ++ lo->lo_number); ++ if (!lo->wq) ++ goto out_putf; + + error = 0; + +@@ -924,6 +928,8 @@ static int loop_clr_fd(struct loop_device *lo) + lo->lo_flags = 0; + if (!part_shift) + lo->lo_disk->flags |= GENHD_FL_NO_PART_SCAN; ++ destroy_workqueue(lo->wq); ++ lo->wq = NULL; + mutex_unlock(&lo->lo_ctl_mutex); + /* + * Need not hold lo_ctl_mutex to fput backing file. +@@ -1477,9 +1483,13 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx, + const struct blk_mq_queue_data *bd) + { + struct loop_cmd *cmd = blk_mq_rq_to_pdu(bd->rq); ++ struct loop_device *lo = cmd->rq->q->queuedata; + + blk_mq_start_request(bd->rq); + ++ if (lo->lo_state != Lo_bound) ++ return -EIO; ++ + if (cmd->rq->cmd_flags & REQ_WRITE) { + struct loop_device *lo = cmd->rq->q->queuedata; + bool need_sched = true; +@@ -1493,9 +1503,9 @@ static int loop_queue_rq(struct blk_mq_hw_ctx *hctx, + spin_unlock_irq(&lo->lo_lock); + + if (need_sched) +- queue_work(loop_wq, &lo->write_work); ++ queue_work(lo->wq, &lo->write_work); + } else { +- queue_work(loop_wq, &cmd->read_work); ++ queue_work(lo->wq, &cmd->read_work); + } + + return BLK_MQ_RQ_QUEUE_OK; +@@ -1507,9 +1517,6 @@ static void loop_handle_cmd(struct loop_cmd *cmd) + struct loop_device *lo = cmd->rq->q->queuedata; + int ret = -EIO; + +- if (lo->lo_state != Lo_bound) +- goto failed; +- + if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY)) + goto failed; + +@@ -1858,13 +1865,6 @@ static int __init loop_init(void) + goto misc_out; + } + +- loop_wq = alloc_workqueue("kloopd", +- WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 0); +- if (!loop_wq) { +- err = -ENOMEM; +- goto misc_out; +- } +- + blk_register_region(MKDEV(LOOP_MAJOR, 0), range, + THIS_MODULE, loop_probe, NULL, NULL); + +@@ -1902,8 +1902,6 @@ static void __exit loop_exit(void) + blk_unregister_region(MKDEV(LOOP_MAJOR, 0), range); + unregister_blkdev(LOOP_MAJOR, "loop"); + +- destroy_workqueue(loop_wq); +- + misc_deregister(&loop_misc); + } + +diff --git a/drivers/block/loop.h b/drivers/block/loop.h +index 301c27f..49564ed 100644 +--- a/drivers/block/loop.h ++++ b/drivers/block/loop.h +@@ -54,6 +54,7 @@ struct loop_device { + gfp_t old_gfp_mask; + + spinlock_t lo_lock; ++ struct workqueue_struct *wq; + struct list_head write_cmd_head; + struct work_struct write_work; + bool write_started; +-- +2.4.5 + diff --git a/kernels/linux-libre-xen/0002-block-loop-avoiding-too-many-pending-per-work-I-O.patch b/kernels/linux-libre-xen/0002-block-loop-avoiding-too-many-pending-per-work-I-O.patch new file mode 100644 index 000000000..c02a0b321 --- /dev/null +++ b/kernels/linux-libre-xen/0002-block-loop-avoiding-too-many-pending-per-work-I-O.patch @@ -0,0 +1,52 @@ +From 02a6b08b2706501fb0fe6ff2df2f7d8377f2f69b Mon Sep 17 00:00:00 2001 +From: Ming Lei <ming.lei@canonical.com> +Date: Tue, 5 May 2015 19:49:55 +0800 +Subject: [PATCH 2/2] block: loop: avoiding too many pending per work I/O + +If there are too many pending per work I/O, too many +high priority work thread can be generated so that +system performance can be effected. + +This patch limits the max_active parameter of workqueue as 16. + +This patch fixes Fedora 22 live booting performance +regression when it is booted from squashfs over dm +based on loop, and looks the following reasons are +related with the problem: + +- not like other filesyststems(such as ext4), squashfs +is a bit special, and I observed that increasing I/O jobs +to access file in squashfs only improve I/O performance a +little, but it can make big difference for ext4 + +- nested loop: both squashfs.img and ext3fs.img are mounted +as loop block, and ext3fs.img is inside the squashfs + +- during booting, lots of tasks may run concurrently + +Fixes: b5dd2f6047ca108001328aac0e8588edd15f1778 +Cc: stable@vger.kernel.org (v4.0) +Cc: Justin M. Forbes <jforbes@fedoraproject.org> +Signed-off-by: Ming Lei <ming.lei@canonical.com> +Acked-by: Tejun Heo <tj@kernel.org> +Signed-off-by: Jens Axboe <axboe@fb.com> +--- + drivers/block/loop.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/drivers/block/loop.c b/drivers/block/loop.c +index fec06d5..daaaf70 100644 +--- a/drivers/block/loop.c ++++ b/drivers/block/loop.c +@@ -777,7 +777,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, + goto out_putf; + error = -ENOMEM; + lo->wq = alloc_workqueue("kloopd%d", +- WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 0, ++ WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_UNBOUND, 16, + lo->lo_number); + if (!lo->wq) + goto out_putf; +-- +2.4.5 + diff --git a/kernels/linux-libre-xen/PKGBUILD b/kernels/linux-libre-xen/PKGBUILD index 98420c0e1..0cbde187f 100644 --- a/kernels/linux-libre-xen/PKGBUILD +++ b/kernels/linux-libre-xen/PKGBUILD @@ -9,7 +9,7 @@ pkgbase=linux-libre-xen # Build stock -xen kernel _pkgbasever=4.0-gnu -_pkgver=4.0.6-gnu +_pkgver=4.0.7-gnu _replacesarchkernel=('linux%') # '%' gets replaced with _kernelname _replacesoldkernels=('kernel26%' 'kernel26-libre%') # '%' gets replaced with _kernelname @@ -18,7 +18,7 @@ _replacesoldmodules=() # '%' gets replaced with _kernelname _srcname=linux-${_pkgbasever%-*} _archpkgver=${_pkgver%-*} pkgver=${_pkgver//-/_} -pkgrel=1 +pkgrel=2 arch=('i686') url="http://linux-libre.fsfla.org/" license=('GPL2') @@ -38,10 +38,12 @@ source=("http://linux-libre.fsfla.org/pub/linux-libre/releases/${_pkgbasever}/li 'config' # standard config files for mkinitcpio ramdisk 'linux.preset' + '0001-block-loop-convert-to-per-device-workqueue.patch' + '0002-block-loop-avoiding-too-many-pending-per-work-I-O.patch' 'change-default-console-loglevel.patch') sha256sums=('0e2dd5be12c1f82ab3d03b89cbe3f1a20e14332ec42c102efb226a6283fdd38a' 'SKIP' - '5cfcee748701771bb2ad46887c6b912fedfffe84bba42ad9e051be54f03a63c9' + 'c106ac1baa327ba39fc479c6b7b5c3a9f0a523ecc4db2a0be6a1f6f700d5cc53' 'SKIP' 'bfd4a7f61febe63c880534dcb7c31c5b932dde6acf991810b41a939a93535494' 'SKIP' @@ -51,6 +53,8 @@ sha256sums=('0e2dd5be12c1f82ab3d03b89cbe3f1a20e14332ec42c102efb226a6283fdd38a' 'SKIP' '829578ec9d35cae1f7fa559c6cab1d13ca21bc91be88f9f110e7ee70e698e659' 'f0d90e756f14533ee67afda280500511a62465b4f76adcc5effa95a40045179c' + '0682df710e8d23f0d420b3b01fbfe409b3911940b1a379b78d9f4a5ac8590386' + 'af42b1456caee0b0db8f3cc770c78083b40159260b99db4930e503ac7824eacc' '1256b241cd477b265a3c2d64bdc19ffe3c9bbcee82ea3994c590c2c76e767d99') validpgpkeys=( '474402C8C582DAFBE389C427BCB7CF877E7D47A7' # Alexandre Oliva @@ -77,6 +81,11 @@ prepare() { # add latest fixes from stable queue, if needed # http://git.kernel.org/?p=linux/kernel/git/stable/stable-queue.git + # Fix deadlock with stacked loop devices (FS#45129) + # http://marc.info/?l=linux-kernel&m=143280649731902&w=2 + patch -Np1 -i ../0001-block-loop-convert-to-per-device-workqueue.patch + patch -Np1 -i ../0002-block-loop-avoiding-too-many-pending-per-work-I-O.patch + # set DEFAULT_CONSOLE_LOGLEVEL to 4 (same value as the 'quiet' kernel param) # remove this when a Kconfig knob is made available by upstream # (relevant patch sent upstream: https://lkml.org/lkml/2011/7/26/227) |