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af1dd7ff46
This patch has tcmu internally queue cmds if its ring buffer is full. It also makes the TCMU_GLOBAL_MAX_BLOCKS limit a hint instead of a hard limit, so we do not have to add any new locks/atomics in the main IO path except when IO is not running. This fixes the following bugs: 1. We cannot sleep from the submitting context because it might be called from a target recv context. This results in transport level commands timing out. For example if the ring is full, we would sleep, and a iscsi initiator would send a iscsi ping/nop which times out because the target's recv thread is sleeping here. 2. Devices were not fairly scheduled to run when they hit the global limit so they could time out waiting for ring space while others got run. Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> |
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arch | ||
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certs | ||
crypto | ||
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drivers | ||
firmware | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
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.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
README |
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.