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f999f38b4e
Patch series "mm: zswap: move writeback LRU from zpool to zswap", v3. This series aims to improve the zswap reclaim mechanism by reorganizing the LRU management. In the current implementation, the LRU is maintained within each zpool driver, resulting in duplicated code across the three drivers. The proposed change consists in moving the LRU management from the individual implementations up to the zswap layer. The primary objective of this refactoring effort is to simplify the codebase. By unifying the reclaim loop and consolidating LRU handling within zswap, we can eliminate redundant code and improve maintainability. Additionally, this change enables the reclamation of stored pages in their actual LRU order. Presently, the zpool drivers link backing pages in an LRU, causing compressed pages with different LRU positions to be written back simultaneously. The series consists of several patches. The first patch implements the LRU and the reclaim loop in zswap, but it is not used yet because all three driver implementations are marked as zpool_evictable. The following three commits modify each zpool driver to be not zpool_evictable, allowing the use of the reclaim loop in zswap. As the drivers removed their shrink functions, the zpool interface is then trimmed by removing zpool_evictable, zpool_ops, and zpool_shrink. Finally, the code in zswap is further cleaned up by simplifying the writeback function and removing the now unnecessary zswap_header. This patch (of 7): Each zpool driver (zbud, z3fold and zsmalloc) implements its own shrink function, which is called from zpool_shrink. However, with this commit, a unified shrink function is added to zswap. The ultimate goal is to eliminate the need for zpool_shrink once all zpool implementations have dropped their shrink code. To ensure the functionality of each commit, this change focuses solely on adding the mechanism itself. No modifications are made to the backends, meaning that functionally, there are no immediate changes. The zswap mechanism will only come into effect once the backends have removed their shrink code. The subsequent commits will address the modifications needed in the backends. Link: https://lkml.kernel.org/r/20230612093815.133504-1-cerasuolodomenico@gmail.com Link: https://lkml.kernel.org/r/20230612093815.133504-2-cerasuolodomenico@gmail.com Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@gmail.com> Acked-by: Nhat Pham <nphamcs@gmail.com> Tested-by: Yosry Ahmed <yosryahmed@google.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Yosry Ahmed <yosryahmed@google.com> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> 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 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.