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Filename Latest commit message Latest commit date
Ming Lei bffa9909a6 blk-mq: don't keep offline CPUs mapped to hctx 0 
From commit 4b855ad371 ("blk-mq: Create hctx for each present CPU),
blk-mq doesn't remap queue after CPU topo is changed, that said when
some of these offline CPUs become online, they are still mapped to
hctx 0, then hctx 0 may become the bottleneck of IO dispatch and
completion.

This patch sets up the mapping from the beginning, and aligns to
queue mapping for PCI device (blk_mq_pci_map_queues()).

Cc: Stefan Haberland <sth@linux.vnet.ibm.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: stable@vger.kernel.org
Fixes: 4b855ad371 ("blk-mq: Create hctx for each present CPU)
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-04-10 08:38:46 -06:00
arch SCSI for-linus on 20180404 2018-04-05 15:05:53 -07:00
block blk-mq: don't keep offline CPUs mapped to hctx 0 2018-04-10 08:38:46 -06:00
certs
crypto
Documentation SCSI for-linus on 20180404 2018-04-05 15:05:53 -07:00
drivers loop: fix LOOP_GET_STATUS lock imbalance 2018-04-10 08:38:46 -06:00
firmware
fs for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
include SCSI for-linus on 20180404 2018-04-05 15:05:53 -07:00
init
ipc
kernel
lib for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
LICENSES
mm for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
net for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
samples
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usr
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MAINTAINERS SCSI for-linus on 20180404 2018-04-05 15:05:53 -07:00
Makefile
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.