c75f5c1e0f
Patch series "mm/zswap: dstmem reuse optimizations and cleanups", v5. The problem this series tries to optimize is that zswap_load() and zswap_writeback_entry() have to malloc a temporary memory to support !zpool_can_sleep_mapped(). We can avoid it by reusing the percpu crypto_acomp_ctx->dstmem, which is also used by zswap_store() and protected by the same percpu crypto_acomp_ctx->mutex. This patch (of 5): In the !zpool_can_sleep_mapped() case such as zsmalloc, we need to first copy the entry->handle memory to a temporary memory, which is allocated using kmalloc. Obviously we can reuse the per-compressor dstmem to avoid allocating every time, since it's percpu-compressor and protected in percpu mutex. Link: https://lkml.kernel.org/r/20231213-zswap-dstmem-v5-0-9382162bbf05@bytedance.com Link: https://lkml.kernel.org/r/20231213-zswap-dstmem-v5-1-9382162bbf05@bytedance.com Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Nhat Pham <nphamcs@gmail.com> Reviewed-by: Yosry Ahmed <yosryahmed@google.com> Acked-by: Chris Li <chrisl@kernel.org> (Google) Cc: Barry Song <21cnbao@gmail.com> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Seth Jennings <sjenning@redhat.com> Cc: Vitaly Wool <vitaly.wool@konsulko.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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.