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author | Alexander Monakov <amonakov@ispras.ru> | 2017-12-16 14:27:25 +0300 |
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committer | Rich Felker <dalias@aerifal.cx> | 2018-04-11 15:37:44 -0400 |
commit | 424eab2225ff3f8e3ae9f9eec9dacf2f68b71a2f (patch) | |
tree | 892438e5ca17e4bb4c990593a47357dd467cb553 /src/unistd/read.c | |
parent | 10e4bd3780050e75b72aac5d85c31816419bb17d (diff) | |
download | musl-424eab2225ff3f8e3ae9f9eec9dacf2f68b71a2f.tar.gz musl-424eab2225ff3f8e3ae9f9eec9dacf2f68b71a2f.tar.xz musl-424eab2225ff3f8e3ae9f9eec9dacf2f68b71a2f.zip |
optimize malloc0
Implementation of __malloc0 in malloc.c takes care to preserve zero pages by overwriting only non-zero data. However, malloc must have already modified auxiliary heap data just before and beyond the allocated region, so we know that edge pages need not be preserved. For allocations smaller than one page, pass them immediately to memset. Otherwise, use memset to handle partial pages at the head and tail of the allocation, and scan complete pages in the interior. Optimize the scanning loop by processing 16 bytes per iteration and handling rest of page via memset as soon as a non-zero byte is found.
Diffstat (limited to 'src/unistd/read.c')
0 files changed, 0 insertions, 0 deletions