linux-stable

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Dai Ngo 4b676584d0 SUNRPC: increase size of rpc_wait_queue.qlen from unsigned short to unsigned int [ Upstream commit `2c35f43b5a` ] When the NFS client is under extreme load the rpc_wait_queue.qlen counter can be overflowed. Here is an instant of the backlog queue overflow in a real world environment shown by drgn helper: rpc_task_stats(rpc_clnt): ------------------------- rpc_clnt: 0xffff92b65d2bae00 rpc_xprt: 0xffff9275db64f000 Queue: sending[64887] pending[524] backlog[30441] binding[0] XMIT task: 0xffff925c6b1d8e98 WRITE: 750654 __dta_call_status_580: 65463 __dta_call_transmit_status_579: 1 call_reserveresult: 685189 nfs_client_init_is_complete: 1 COMMIT: 584 call_reserveresult: 573 __dta_call_status_580: 11 ACCESS: 1 __dta_call_status_580: 1 GETATTR: 10 __dta_call_status_580: 4 call_reserveresult: 6 751249 tasks for server 111.222.333.444 Total tasks: 751249 count_rpc_wait_queues(xprt): ---------------------------- **** rpc_xprt: 0xffff9275db64f000 num_reqs: 65511 wait_queue: xprt_binding[0] cnt: 0 wait_queue: xprt_binding[1] cnt: 0 wait_queue: xprt_binding[2] cnt: 0 wait_queue: xprt_binding[3] cnt: 0 rpc_wait_queue[xprt_binding].qlen: 0 maxpriority: 0 wait_queue: xprt_sending[0] cnt: 0 wait_queue: xprt_sending[1] cnt: 64887 wait_queue: xprt_sending[2] cnt: 0 wait_queue: xprt_sending[3] cnt: 0 rpc_wait_queue[xprt_sending].qlen: 64887 maxpriority: 3 wait_queue: xprt_pending[0] cnt: 524 wait_queue: xprt_pending[1] cnt: 0 wait_queue: xprt_pending[2] cnt: 0 wait_queue: xprt_pending[3] cnt: 0 rpc_wait_queue[xprt_pending].qlen: 524 maxpriority: 0 wait_queue: xprt_backlog[0] cnt: 0 wait_queue: xprt_backlog[1] cnt: 685801 wait_queue: xprt_backlog[2] cnt: 0 wait_queue: xprt_backlog[3] cnt: 0 rpc_wait_queue[xprt_backlog].qlen: 30441 maxpriority: 3 [task cnt mismatch] There is no effect on operations when this overflow occurs. However it causes confusion when trying to diagnose the performance problem. Signed-off-by: Dai Ngo <dai.ngo@oracle.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-13 12:59:48 +02:00
arch	arm64: dts: rockchip: fix rk3399 hdmi ports node	2024-04-13 12:59:40 +02:00
block	block: add check that partition length needs to be aligned with block size	2024-04-13 12:59:23 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:13:17 +02:00
crypto	crypto: api - Disallow identical driver names	2024-02-23 08:41:52 +01:00
Documentation	x86/cpu: Enable STIBP on AMD if Automatic IBRS is enabled	2024-04-13 12:59:13 +02:00
drivers	drm/amd/display: Fix nanosec stat overflow	2024-04-13 12:59:47 +02:00
fs	ext4: forbid commit inconsistent quota data when errors=remount-ro	2024-04-13 12:59:47 +02:00
include	SUNRPC: increase size of rpc_wait_queue.qlen from unsigned short to unsigned int	2024-04-13 12:59:48 +02:00
init	init: open /initrd.image with O_LARGEFILE	2024-04-13 12:59:02 +02:00
io_uring	io_uring: ensure '0' is returned on file registration success	2024-04-13 12:59:22 +02:00
ipc	ipc/sem: Fix dangling sem_array access in semtimedop race	2022-12-08 11:24:00 +01:00
kernel	panic: Flush kernel log buffer at the end	2024-04-13 12:59:40 +02:00
lib	net: blackhole_dev: fix build warning for ethh set but not used	2024-03-26 18:21:50 -04:00
LICENSES
mm	mm, vmscan: prevent infinite loop for costly GFP_NOIO \| __GFP_RETRY_MAYFAIL allocations	2024-04-13 12:59:22 +02:00
net	net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()	2024-04-13 12:59:43 +02:00
samples	samples/hw_breakpoint: fix building without module unloading	2023-09-23 11:01:09 +02:00
scripts	scripts: kernel-doc: Fix syntax error due to undeclared args variable	2024-04-13 12:58:46 +02:00
security	smack: Handle SMACK64TRANSMUTE in smack_inode_setsecurity()	2024-04-13 12:58:00 +02:00
sound	ALSA: hda/realtek: Update Panasonic CF-SZ6 quirk to support headset with microphone	2024-04-13 12:59:34 +02:00
tools	tools/power x86_energy_perf_policy: Fix file leak in get_pkg_num()	2024-04-13 12:59:42 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:25:48 +01:00
virt	KVM: Always flush async #PF workqueue when vCPU is being destroyed	2024-04-13 12:58:04 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore	kbuild: generate Module.symvers only when vmlinux exists	2021-05-19 10:12:59 +02:00
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	Remove DECnet support from kernel	2023-06-21 15:45:38 +02:00
Makefile	Linux 5.10.214	2024-03-26 18:23:07 -04:00
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.

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.