This is a note to let you know that I've just added the patch titled

block-throttle: avoid double charge

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: block-throttle-avoid-double-charge.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 111be883981748acc9a56e855c8336404a8e787c Mon Sep 17 00:00:00 2001

From: Shaohua Li shli@fb.com Date: Wed, 20 Dec 2017 11:10:17 -0700 Subject: block-throttle: avoid double charge

From: Shaohua Li shli@fb.com

commit 111be883981748acc9a56e855c8336404a8e787c upstream.

If a bio is throttled and split after throttling, the bio could be resubmited and enters the throttling again. This will cause part of the bio to be charged multiple times. If the cgroup has an IO limit, the double charge will significantly harm the performance. The bio split becomes quite common after arbitrary bio size change.

To fix this, we always set the BIO_THROTTLED flag if a bio is throttled. If the bio is cloned/split, we copy the flag to new bio too to avoid a double charge. However, cloned bio could be directed to a new disk, keeping the flag be a problem. The observation is we always set new disk for the bio in this case, so we can clear the flag in bio_set_dev().

This issue exists for a long time, arbitrary bio size change just makes it worse, so this should go into stable at least since v4.2.

V1-> V2: Not add extra field in bio based on discussion with Tejun

Cc: Vivek Goyal vgoyal@redhat.com Acked-by: Tejun Heo tj@kernel.org Signed-off-by: Shaohua Li shli@fb.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- block/bio.c | 2 ++ block/blk-throttle.c | 8 +------- include/linux/bio.h | 2 ++ include/linux/blk_types.h | 9 ++++----- 4 files changed, 9 insertions(+), 12 deletions(-)

--- a/block/bio.c +++ b/block/bio.c @@ -599,6 +599,8 @@ void __bio_clone_fast(struct bio *bio, s bio->bi_disk = bio_src->bi_disk; bio->bi_partno = bio_src->bi_partno; bio_set_flag(bio, BIO_CLONED); + if (bio_flagged(bio_src, BIO_THROTTLED)) + bio_set_flag(bio, BIO_THROTTLED); bio->bi_opf = bio_src->bi_opf; bio->bi_write_hint = bio_src->bi_write_hint; bio->bi_iter = bio_src->bi_iter; --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -2223,13 +2223,7 @@ again: out_unlock: spin_unlock_irq(q->queue_lock); out: - /* - * As multiple blk-throtls may stack in the same issue path, we - * don't want bios to leave with the flag set. Clear the flag if - * being issued. - */ - if (!throttled) - bio_clear_flag(bio, BIO_THROTTLED); + bio_set_flag(bio, BIO_THROTTLED);

#ifdef CONFIG_BLK_DEV_THROTTLING_LOW if (throttled || !td->track_bio_latency) --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -504,6 +504,8 @@ extern unsigned int bvec_nr_vecs(unsigne

#define bio_set_dev(bio, bdev) \ do { \ + if ((bio)->bi_disk != (bdev)->bd_disk) \ + bio_clear_flag(bio, BIO_THROTTLED);\ (bio)->bi_disk = (bdev)->bd_disk; \ (bio)->bi_partno = (bdev)->bd_partno; \ } while (0) --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -50,8 +50,6 @@ struct blk_issue_stat { struct bio { struct bio *bi_next; /* request queue link */ struct gendisk *bi_disk; - u8 bi_partno; - blk_status_t bi_status; unsigned int bi_opf; /* bottom bits req flags, * top bits REQ_OP. Use * accessors. @@ -59,8 +57,8 @@ struct bio { unsigned short bi_flags; /* status, etc and bvec pool number */ unsigned short bi_ioprio; unsigned short bi_write_hint; - - struct bvec_iter bi_iter; + blk_status_t bi_status; + u8 bi_partno;

/* Number of segments in this BIO after * physical address coalescing is performed. @@ -74,8 +72,9 @@ struct bio { unsigned int bi_seg_front_size; unsigned int bi_seg_back_size;

- atomic_t __bi_remaining; + struct bvec_iter bi_iter;

+ atomic_t __bi_remaining; bio_end_io_t *bi_end_io;

void *bi_private;

Patches currently in stable-queue which might be from shli@fb.com are

queue-4.14/block-throttle-avoid-double-charge.patch