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Date: Wed, 3 May 2017 11:24:51 +0800 From: Ming Lei <tom.leiming@...il.com> To: NeilBrown <neilb@...e.com> Cc: Jens Axboe <axboe@...nel.dk>, linux-block <linux-block@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de> Subject: Re: [PATCH 03/13 V2] blk: make the bioset rescue_workqueue optional. On Wed, May 3, 2017 at 6:34 AM, NeilBrown <neilb@...e.com> wrote: > From 09017acf74ec4df674b78ca66f0924187f10d8a4 Mon Sep 17 00:00:00 2001 > From: NeilBrown <neilb@...e.com> > Date: Fri, 10 Mar 2017 13:59:50 +1100 > Subject: [PATCH] blk: make the bioset rescue_workqueue optional. > > This patch converts bioset_create() to not create a workqueue by > default, so alloctions will never trigger punt_bios_to_rescuer(). It > also introduces a new flag BIOSET_NEED_RESCUER() which tells > bioset_create() to preserve the old behavior. > > All callers of bioset_create() that are inside block device drivers, > are given the BIOSET_NEED_RESCUER(). > > biosets used by filesystems or other top-level users do not > need rescuing as the bio can never be queued behind other > bios. This includes fs_bio_set, blkdev_dio_pool, > btrfs_bioset, xfs_ioend_bioset, and one allocated by > target_core_iblock.c. > > biosets used by md/raid do not need rescuing as > their usage was recently audited and revised to never > risk deadlock. > > It is hoped that most, if not all, of the remaining biosets > can end up being the non-rescued version. > > Reviewed-by: Christoph Hellwig <hch@....de> > Credit-to: Ming Lei <ming.lei@...hat.com> (minor fixes) > Signed-off-by: NeilBrown <neilb@...e.com> Reviewed-by: Ming Lei <ming.lei@...hat.com> Thanks, Ming
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