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author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2021-05-05 03:32:45 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-05-05 20:27:19 +0200 |
commit | 7716506adac4664793a9d6d3dfa31ffddfa98714 (patch) | |
tree | ec099a414e8120e3e68e2e6022eed8fa6fff5a3b /usr | |
parent | mm/memory-failure: unnecessary amount of unmapping (diff) | |
download | linux-7716506adac4664793a9d6d3dfa31ffddfa98714.tar.xz linux-7716506adac4664793a9d6d3dfa31ffddfa98714.zip |
mm: introduce and use mapping_empty()
Patch series "Remove nrexceptional tracking", v2.
We actually use nrexceptional for very little these days. It's a minor
pain to keep in sync with nrpages, but the pain becomes much bigger with
the THP patches because we don't know how many indices a shadow entry
occupies. It's easier to just remove it than keep it accurate.
Also, we save 8 bytes per inode which is nothing to sneeze at; on my
laptop, it would improve shmem_inode_cache from 22 to 23 objects per
16kB, and inode_cache from 26 to 27 objects. Combined, that saves
a megabyte of memory from a combined usage of 25MB for both caches.
Unfortunately, ext4 doesn't cross a magic boundary, so it doesn't save
any memory for ext4.
This patch (of 4):
Instead of checking the two counters (nrpages and nrexceptional), we can
just check whether i_pages is empty.
Link: https://lkml.kernel.org/r/20201026151849.24232-1-willy@infradead.org
Link: https://lkml.kernel.org/r/20201026151849.24232-2-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Tested-by: Vishal Verma <vishal.l.verma@intel.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions