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Zach O'Keefe 0f633baac0 selftests/vm: add selftest for MADV_COLLAPSE of uffd-minor memory
Add :collapse mod to userfaultfd selftest.  Currently this mod is only
valid for "shmem" test type, but could be used for other test types.

When provided, memory allocated by ->allocate_area() will be
hugepage-aligned enforced to be hugepage-sized.  userfaultf_minor_test,
after the UFFD-registered mapping has been populated by UUFD minor fault
handler, attempt to MADV_COLLAPSE the UFFD-registered mapping to collapse
the memory into a pmd-mapped THP.

This test is meant to be a functional test of what occurs during
UFFD-driven live migration of VMs backed by huge tmpfs where, after a
hugepage-sized region has been successfully migrated (in native page-sized
chunks, to avoid latency of fetched a hugepage over the network), we want
to reclaim previous VM performance by remapping it at the PMD level.

Link: https://lkml.kernel.org/r/20220907144521.3115321-11-zokeefe@google.com
Link: https://lkml.kernel.org/r/20220922224046.1143204-11-zokeefe@google.com
Signed-off-by: Zach O'Keefe <zokeefe@google.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Chris Kennelly <ckennelly@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: James Houghton <jthoughton@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Rongwei Wang <rongwei.wang@linux.alibaba.com>
Cc: SeongJae Park <sj@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2022-10-03 14:03:35 -07:00
arch x86: kmsan: handle CPU entry area 2022-10-03 14:03:26 -07:00
block block: kmsan: skip bio block merging logic for KMSAN 2022-10-03 14:03:23 -07:00
certs Kbuild updates for v5.20 2022-08-10 10:40:41 -07:00
crypto crypto: kmsan: disable accelerated configs under KMSAN 2022-10-03 14:03:22 -07:00
Documentation mm/khugepaged: attempt to map file/shmem-backed pte-mapped THPs by pmds 2022-10-03 14:03:33 -07:00
drivers crypto: kmsan: disable accelerated configs under KMSAN 2022-10-03 14:03:22 -07:00
fs mm: fs: initialize fsdata passed to write_begin/write_end interface 2022-10-03 14:03:25 -07:00
include mm/khugepaged: add tracepoint to hpage_collapse_scan_file() 2022-10-03 14:03:33 -07:00
init init: kmsan: call KMSAN initialization routines 2022-10-03 14:03:21 -07:00
io_uring io_uring/net: save address for sendzc async execution 2022-08-25 07:52:30 -06:00
ipc ipc/shm: use VMA iterator instead of linked list 2022-09-26 19:46:21 -07:00
kernel mm/madvise: add file and shmem support to MADV_COLLAPSE 2022-10-03 14:03:33 -07:00
lib kmsan: disable strscpy() optimization under KMSAN 2022-10-03 14:03:22 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm mm/khugepaged: add tracepoint to hpage_collapse_scan_file() 2022-10-03 14:03:33 -07:00
net Including fixes from ipsec and netfilter (with one broken Fixes tag). 2022-08-25 14:03:58 -07:00
samples Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
scripts kmsan: add KMSAN runtime core 2022-10-03 14:03:19 -07:00
security security: kmsan: fix interoperability with auto-initialization 2022-10-03 14:03:23 -07:00
sound sound fixes for 6.0-rc2 2022-08-19 09:46:11 -07:00
tools selftests/vm: add selftest for MADV_COLLAPSE of uffd-minor memory 2022-10-03 14:03:35 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: Drop unnecessary initialization of "ops" in kvm_ioctl_create_device() 2022-08-19 04:05:43 -04:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap .mailmap: update Luca Ceresoli's e-mail address 2022-08-28 14:02:46 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
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 x86: kmsan: handle CPU entry area 2022-10-03 14:03:26 -07:00
Makefile kmsan: add KMSAN runtime core 2022-10-03 14:03:19 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.