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Wei Wang f5a5589c72 tcp: use a smaller percpu_counter batch size for sk_alloc
Currently, a percpu_counter with the default batch size (2*nr_cpus) is
used to record the total # of active sockets per protocol. This means
sk_sockets_allocated_read_positive() could be off by +/-2*(nr_cpus^2).
This under/over-estimation could lead to wrong memory suppression
conditions in __sk_raise_mem_allocated().
Fix this by using a more reasonable fixed batch size of 16.

See related commit cf86a086a1 ("net/dst: use a smaller percpu_counter
batch for dst entries accounting") that addresses a similar issue.

Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Soheil Hassas Yeganeh <soheil@google.com>
Link: https://lore.kernel.org/r/20210202193408.1171634-1-weiwan@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-02-03 18:43:17 -08:00
arch
block
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crypto
Documentation ethtool: Extend link modes settings uAPI with lanes 2021-02-03 18:37:28 -08:00
drivers mlxsw: ethtool: Pass link mode in use to ethtool 2021-02-03 18:37:29 -08:00
fs
include tcp: use a smaller percpu_counter batch size for sk_alloc 2021-02-03 18:43:17 -08:00
init
ipc
kernel
lib
LICENSES
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net ethtool: Expose the number of lanes in use 2021-02-03 18:37:29 -08:00
samples
scripts
security
sound
tools net: selftests: Add lanes setting test 2021-02-03 18:37:29 -08:00
usr
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
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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.