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fe5266d5d5
In mm/swapfile.c, THP (Transparent Huge Page) swap specific code is enclosed by #ifdef CONFIG_THP_SWAP/#endif to avoid code dilating when THP isn't enabled. But #ifdef/#endif in .c file hurt the code readability, so Dave suggested to use IS_ENABLED(CONFIG_THP_SWAP) instead and let compiler to do the dirty job for us. This has potential to remove some duplicated code too. From output of `size`, text data bss dec hex filename THP=y: 26269 2076 340 28685 700d mm/swapfile.o ifdef/endif: 24115 2028 340 26483 6773 mm/swapfile.o IS_ENABLED: 24179 2028 340 26547 67b3 mm/swapfile.o IS_ENABLED() based solution works quite well, almost as good as that of #ifdef/#endif. And from the diffstat, the removed lines are more than added lines. One #ifdef for split_swap_cluster() is kept. Because it is a public function with a stub implementation for CONFIG_THP_SWAP=n in swap.h. Link: http://lkml.kernel.org/r/20180720071845.17920-3-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Suggested-and-acked-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Shaohua Li <shli@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Rik van Riel <riel@redhat.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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| 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.