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a0b856b617
Now the implementation of stable_node_dup() causes chain()/chain_prune() interfaces and usages are overcomplicated. Why? stable_node_dup() only find and return a candidate stable_node for sharing, so the users have to recheck using stable_node_dup_any() if any non-candidate stable_node exist. And try to ksm_get_folio() from it again. Actually, stable_node_dup() can just return a best stable_node as it can, then the users can check if it's a candidate for sharing or not. The code is simplified too and fewer corner cases: such as stable_node and stable_node_dup can't be NULL if returned tree_folio is not NULL. Link: https://lkml.kernel.org/r/20240621-b4-ksm-scan-optimize-v2-3-1c328aa9e30b@linux.dev Signed-off-by: Chengming Zhou <chengming.zhou@linux.dev> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Hildenbrand <david@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Stefan Roesch <shr@devkernel.io> 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 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.