WSL2-Linux-Kernel

The source for the Linux kernel used in Windows Subsystem for Linux 2 (WSL2)

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Andrey Ryabinin 3386353406 mm: mempolicy: fix THP allocations escaping mempolicy restrictions alloc_pages_vma() may try to allocate THP page on the local NUMA node first: page = __alloc_pages_node(hpage_node, gfp \| __GFP_THISNODE \| __GFP_NORETRY, order); And if the allocation fails it retries allowing remote memory: if (!page && (gfp & __GFP_DIRECT_RECLAIM)) page = __alloc_pages_node(hpage_node, gfp, order); However, this retry allocation completely ignores memory policy nodemask allowing allocation to escape restrictions. The first appearance of this bug seems to be the commit `ac5b2c1891` ("mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings"). The bug disappeared later in the commit `89c83fb539` ("mm, thp: consolidate THP gfp handling into alloc_hugepage_direct_gfpmask") and reappeared again in slightly different form in the commit `76e654cc91` ("mm, page_alloc: allow hugepage fallback to remote nodes when madvised") Fix this by passing correct nodemask to the __alloc_pages() call. The demonstration/reproducer of the problem: $ mount -oremount,size=4G,huge=always /dev/shm/ $ echo always > /sys/kernel/mm/transparent_hugepage/defrag $ cat mbind_thp.c #include <unistd.h> #include <sys/mman.h> #include <sys/stat.h> #include <fcntl.h> #include <assert.h> #include <stdlib.h> #include <stdio.h> #include <numaif.h> #define SIZE 2ULL << 30 int main(int argc, char *argv) { int fd; unsigned long long i; char addr; pid_t pid; char buf[100]; unsigned long nodemask = 1; fd = open("/dev/shm/test", O_RDWR\|O_CREAT); assert(fd > 0); assert(ftruncate(fd, SIZE) == 0); addr = mmap(NULL, SIZE, PROT_READ\|PROT_WRITE, MAP_SHARED, fd, 0); assert(mbind(addr, SIZE, MPOL_BIND, &nodemask, 2, MPOL_MF_STRICT\|MPOL_MF_MOVE)==0); for (i = 0; i < SIZE; i+=4096) { addr[i] = 1; } pid = getpid(); snprintf(buf, sizeof(buf), "grep shm /proc/%d/numa_maps", pid); system(buf); sleep(10000); return 0; } $ gcc mbind_thp.c -o mbind_thp -lnuma $ numactl -H available: 2 nodes (0-1) node 0 cpus: 0 2 node 0 size: 1918 MB node 0 free: 1595 MB node 1 cpus: 1 3 node 1 size: 2014 MB node 1 free: 1731 MB node distances: node 0 1 0: 10 20 1: 20 10 $ rm -f /dev/shm/test; taskset -c 0 ./mbind_thp 7fd970a00000 bind:0 file=/dev/shm/test dirty=524288 active=0 N0=396800 N1=127488 kernelpagesize_kB=4 Link: https://lkml.kernel.org/r/20211208165343.22349-1-arbn@yandex-team.com Fixes: `ac5b2c1891` ("mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings") Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: David Rientjes <rientjes@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2021-12-25 12:20:55 -08:00
Documentation	* Fix for compilation of selftests on non-x86 architectures	2021-12-21 12:25:57 -08:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
arch	parisc architecture late bug fixes for kernel v5.16	2021-12-22 10:17:16 -08:00
block	block-5.16-2021-12-19	2021-12-19 12:38:53 -08:00
certs	certs: Add support for using elliptic curve keys for signing modules	2021-08-23 19:55:42 +03:00
crypto	Update to zstd-1.4.10	2021-11-13 15:32:30 -08:00
drivers	Fix some IPMI crashes	2021-12-22 10:11:17 -08:00
fs	Fixes:	2021-12-21 12:02:36 -08:00
include	memblock: fix memblock_phys_alloc() section mismatch error	2021-12-22 11:39:53 -08:00
init	kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x	2021-11-14 18:59:49 -08:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-11-20 10:35:54 -08:00
kernel	- Make sure the CLOCK_REALTIME to CLOCK_MONOTONIC offset is never positive	2021-12-19 12:23:18 -08:00
lib	Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf	2021-12-08 16:06:44 -08:00
mm	mm: mempolicy: fix THP allocations escaping mempolicy restrictions	2021-12-25 12:20:55 -08:00
net	Networking fixes for 5.16-rc6, including fixes from mac80211, wifi, bpf.	2021-12-16 15:02:14 -08:00
samples	ftrace/samples: Add module to test multi direct modify interface	2021-12-09 13:02:44 -05:00
scripts	recordmcount.pl: look for jgnop instruction as well as bcrl on s390	2021-12-12 18:52:26 +01:00
security	Two overhead reduction patches for testing/fuzzing environment.	2021-12-22 10:06:32 -08:00
sound	sound fixes for 5.16-rc5	2021-12-10 11:43:00 -08:00
tools	* Fix for compilation of selftests on non-x86 architectures	2021-12-21 12:25:57 -08:00
usr	initramfs: Check timestamp to prevent broken cpio archive	2021-10-24 13:48:40 +09:00
virt	KVM: downgrade two BUG_ONs to WARN_ON_ONCE	2021-11-26 06:43:28 -05:00
.clang-format	clang-format: Update with the latest for_each macro list	2021-05-12 23:32:39 +02:00
.cocciconfig	…
.get_maintainer.ignore	Opt out of scripts/get_maintainer.pl	2019-05-16 10:53:40 -07:00
.gitattributes	.gitattributes: use 'dts' diff driver for dts files	2019-12-04 19:44:11 -08:00
.gitignore	.gitignore: ignore only top-level modules.builtin	2021-05-02 00:43:35 +09:00
.mailmap	mailmap: update email address for Guo Ren	2021-12-10 17:10:55 -08:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: Move Daniel Drake to credits	2021-09-21 08:34:58 +03:00
Kbuild	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	zonefs fixes for 5.16-rc6	2021-12-17 17:19:51 -08:00
Makefile	Linux 5.16-rc6	2021-12-19 14:14:33 -08:00
README	Drop all 00-INDEX files from Documentation/	2018-09-09 15:08:58 -06:00

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.