mainlining shenanigans
510d25c92e
Recent changes by patch "mm/page_alloc: allow high-order pages to be stored on the per-cpu lists" makes kernels determine whether to use pcp by pcp_allowed_order(), which breaks soft-offline for hugetlb pages. Soft-offline dissolves a migration source page, then removes it from buddy free list, so it's assumed that any subpage of the soft-offlined hugepage are recognized as a buddy page just after returning from dissolve_free_huge_page(). pcp_allowed_order() returns true for hugetlb, so this assumption is no longer true. So disable pcp during dissolve_free_huge_page() and take_page_off_buddy() to prevent soft-offlined hugepages from linking to pcp lists. Soft-offline should not be common events so the impact on performance should be minimal. And I think that the optimization of Mel's patch could benefit to hugetlb so zone_pcp_disable() is called only in hwpoison context. Link: https://lkml.kernel.org/r/20210617092626.291006-1-nao.horiguchi@gmail.com Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Acked-by: Mel Gorman <mgorman@techsingularity.net> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: David Hildenbrand <david@redhat.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.