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| author | Matthew Wilcox <[email protected]> | 2016-12-17 13:18:17 +0000 |
|---|---|---|
| committer | Matthew Wilcox <[email protected]> | 2017-02-14 02:44:02 +0000 |
| commit | d37cacc5adace7f3e0824e1f559192ad7299d029 (patch) | |
| tree | 9932ecc9ba3010ecc53bdbf5cd299eb0842106ec /tools/testing/radix-tree/linux.c | |
| parent | ida: Move ida_bitmap to a percpu variable (diff) | |
| download | kernel-d37cacc5adace7f3e0824e1f559192ad7299d029.tar.gz kernel-d37cacc5adace7f3e0824e1f559192ad7299d029.zip | |
ida: Use exceptional entries for small IDAs
We can use the root entry as a bitmap and save allocating a 128 byte
bitmap for an IDA that contains only a few entries (30 on a 32-bit
machine, 62 on a 64-bit machine). This costs about 300 bytes of kernel
text on x86-64, so as long as 3 IDAs fall into this category, this
is a net win for memory consumption.
Thanks to Rasmus Villemoes for his work documenting the problem and
collecting statistics on IDAs.
Signed-off-by: Matthew Wilcox <[email protected]>
Diffstat (limited to 'tools/testing/radix-tree/linux.c')
0 files changed, 0 insertions, 0 deletions