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6344a6d9ce
If swap_writeout() returns AOP_WRITEPAGE_ACTIVATE (for example, because zswap cannot compress and memcg disables writeback), there is no virtue in keeping that folio in swap cache and holding the swap allocation: shmem_writeout() switch it back to shmem page cache before returning. Folio lock is held, and folio->memcg_data remains set throughout, so there is no need to get into any memcg or memsw charge complications: swap_free_nr() and delete_from_swap_cache() do as much as is needed (but beware the race with shmem_free_swap() when inode truncated or evicted). Doing the same for an anonymous folio is harder, since it will usually have been unmapped, with references to the swap left in the page tables. Adding a function to remap the folio would be fun, but not worthwhile unless it has other uses, or an urgent bug with anon is demonstrated. [hughd@google.com: use shmem_recalc_inode() rather than open coding, per Baolin] Link: https://lkml.kernel.org/r/101a7d89-290c-545d-8a6d-b1174ed8b1e5@google.com Link: https://lkml.kernel.org/r/5c911f7a-af7a-5029-1dd4-2e00b66d565c@google.com Signed-off-by: Hugh Dickins <hughd@google.com> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com> Tested-by: David Rientjes <rientjes@google.com> Cc: Baoquan He <bhe@redhat.com> Cc: Barry Song <21cnbao@gmail.com> Cc: Chris Li <chrisl@kernel.org> Cc: Kairui Song <ryncsn@gmail.com> Cc: Kemeng Shi <shikemeng@huaweicloud.com> Cc: Shakeel Butt <shakeel.butt@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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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 reStructuredText 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.