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Mike Kravetz 79aa925bf2 hugetlb_cgroup: fix reservation accounting 
Michal Privoznik was using "free page reporting" in QEMU/virtio-balloon
with hugetlbfs and hit the warning below.  QEMU with free page hinting
uses fallocate(FALLOC_FL_PUNCH_HOLE) to discard pages that are reported
as free by a VM.  The reporting granularity is in pageblock granularity.
So when the guest reports 2M chunks, we fallocate(FALLOC_FL_PUNCH_HOLE)
one huge page in QEMU.

  WARNING: CPU: 7 PID: 6636 at mm/page_counter.c:57 page_counter_uncharge+0x4b/0x50
  Modules linked in: ...
  CPU: 7 PID: 6636 Comm: qemu-system-x86 Not tainted 5.9.0 #137
  Hardware name: Gigabyte Technology Co., Ltd. X570 AORUS PRO/X570 AORUS PRO, BIOS F21 07/31/2020
  RIP: 0010:page_counter_uncharge+0x4b/0x50
  ...
  Call Trace:
    hugetlb_cgroup_uncharge_file_region+0x4b/0x80
    region_del+0x1d3/0x300
    hugetlb_unreserve_pages+0x39/0xb0
    remove_inode_hugepages+0x1a8/0x3d0
    hugetlbfs_fallocate+0x3c4/0x5c0
    vfs_fallocate+0x146/0x290
    __x64_sys_fallocate+0x3e/0x70
    do_syscall_64+0x33/0x40
    entry_SYSCALL_64_after_hwframe+0x44/0xa9

Investigation of the issue uncovered bugs in hugetlb cgroup reservation
accounting.  This patch addresses the found issues.

Fixes: 075a61d07a ("hugetlb_cgroup: add accounting for shared mappings")
Reported-by: Michal Privoznik <mprivozn@redhat.com>
Co-developed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Tested-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: <stable@vger.kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Link: https://lkml.kernel.org/r/20201021204426.36069-1-mike.kravetz@oracle.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2020-11-02 12:14:18 -08:00
Documentation Char/Misc fixes/removals for 5.10-rc2 2020-11-01 10:05:16 -08:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
arch Three fixes all related to #DB: 2020-11-01 11:21:26 -08:00
block blk-mq: mark flush request as IDLE in flush_end_io() 2020-10-30 08:33:49 -06:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto drivers-5.10-2020-10-12 2020-10-13 13:04:41 -07:00
drivers Char/Misc fixes/removals for 5.10-rc2 2020-11-01 10:05:16 -08:00
fs Driver core / Documentation fixes for 5.10-rc2 2020-11-01 09:59:13 -08:00
include A few fixes for timers/timekeeping: 2020-11-01 11:13:45 -08:00
init linux-kselftest-kunit-5.10-rc1 2020-10-18 14:45:59 -07:00
ipc ipc: adjust proc_ipc_sem_dointvec definition to match prototype 2020-09-05 12:14:29 -07:00
kernel A few fixes for timers/timekeeping: 2020-11-01 11:13:45 -08:00
lib Driver core / Documentation fixes for 5.10-rc2 2020-11-01 09:59:13 -08:00
mm hugetlb_cgroup: fix reservation accounting 2020-11-02 12:14:18 -08:00
net flexible-array member conversion patches for 5.10-rc2 2020-10-31 14:31:28 -07:00
samples misc: mic: remove the MIC drivers 2020-10-28 19:12:03 +01:00
scripts scripts: get_abi.pl: assume ReST format by default 2020-10-30 13:16:03 +01:00
security ima: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
sound ARM: SoC platform updates 2020-10-24 10:33:08 -07:00
tools ARM: 2020-11-01 09:43:32 -08:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt kvm: x86/mmu: Support dirty logging for the TDP MMU 2020-10-23 03:42:13 -04:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.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: docs: ignore sphinx_*/ directories 2020-09-10 10:44:31 -06:00
.mailmap MAINTAINERS: jarkko.sakkinen@linux.intel.com -> jarkko@kernel.org 2020-10-16 11:11:19 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Sangbeom Kim to credits 2020-10-26 10:11:18 +01:00
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 Char/Misc fixes/removals for 5.10-rc2 2020-11-01 10:05:16 -08:00
Makefile Linux 5.10-rc2 2020-11-01 14:43:51 -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.