mirror of
https://github.com/torvalds/linux.git
synced 2026-09-25 21:21:09 -04:00
Jiaqi Yan
12904d9533
Make collapse_file roll back when copying pages failed. More concretely: - extract copying operations into a separate loop - postpone the updates for nr_none until both scanning and copying succeeded - postpone joining small xarray entries until both scanning and copying succeeded - postpone the update operations to NR_XXX_THPS until both scanning and copying succeeded - for non-SHMEM file, roll back filemap_nr_thps_inc if scan succeeded but copying failed Tested manually: 0. Enable khugepaged on system under test. Mount tmpfs at /mnt/ramdisk. 1. Start a two-thread application. Each thread allocates a chunk of non-huge memory buffer from /mnt/ramdisk. 2. Pick 4 random buffer address (2 in each thread) and inject uncorrectable memory errors at physical addresses. 3. Signal both threads to make their memory buffer collapsible, i.e. calling madvise(MADV_HUGEPAGE). 4. Wait and then check kernel log: khugepaged is able to recover from poisoned pages by skipping them. 5. Signal both threads to inspect their buffer contents and make sure no data corruption. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Jiaqi Yan <[email protected]> Reviewed-by: Yang Shi <[email protected]> Acked-by: Hugh Dickins <[email protected]> Cc: David Stevens <[email protected]> Cc: Kefeng Wang <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Cc: Miaohe Lin <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: Oscar Salvador <[email protected]> Cc: Tong Tiangen <[email protected]> Cc: Tony Luck <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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.