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Jan Kara 47aaabdedf fanotify: Avoid softlockups when reading many events
When user provides large buffer for events and there are lots of events
available, we can try to copy them all to userspace without scheduling
which can softlockup the kernel (furthermore exacerbated by the
contention on notification_lock). Add a scheduling point after copying
each event.

Note that usually the real underlying problem is the cost of fanotify
event merging and the resulting contention on notification_lock but this
is a cheap way to somewhat reduce the problem until we can properly
address that.

Reported-by: Francesco Ruggeri <fruggeri@arista.com>
Link: https://lore.kernel.org/lkml/20200714025417.A25EB95C0339@us180.sjc.aristanetworks.com
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2020-07-15 15:23:28 +02:00
arch Raise gcc version requirement to 4.9 2020-07-08 10:48:35 -07:00
block
certs
crypto
Documentation Documentation: update for gcc 4.9 requirement 2020-07-08 12:28:44 -07:00
drivers MTD: 2020-07-07 14:54:02 -07:00
fs fanotify: Avoid softlockups when reading many events 2020-07-15 15:23:28 +02:00
include sound fixes for 5.8-rc5 2020-07-08 11:07:09 -07:00
init
ipc
kernel
lib
LICENSES
mm Raise gcc version requirement to 4.9 2020-07-08 10:48:35 -07:00
net
samples
scripts
security
sound sound fixes for 5.8-rc5 2020-07-08 11:07:09 -07:00
tools Raise gcc version requirement to 4.9 2020-07-08 10:48:35 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
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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.

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.