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author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2015-02-10 13:12:21 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-25 17:04:57 +0300 |
commit | bea2b592fd18eb8ffa3fc4ad380610632d03a38f (patch) | |
tree | 82a139e42a1812111dacc5a23b8b5fcb39058396 /mm/page-writeback.c | |
parent | 7085a7401ba54e92bbb5aa24d6f428071e18e509 (diff) | |
download | linux-bea2b592fd18eb8ffa3fc4ad380610632d03a38f.tar.xz |
lib/lz4: Pull out constant tables
There's no reason to allocate the dec{32,64}table on the stack; it
just wastes a bunch of instructions setting them up and, of course,
also consumes quite a bit of stack. Using size_t for such small
integers is a little excessive.
$ scripts/bloat-o-meter /tmp/built-in.o lib/built-in.o
add/remove: 2/2 grow/shrink: 2/0 up/down: 1304/-1548 (-244)
function old new delta
lz4_decompress_unknownoutputsize 55 718 +663
lz4_decompress 55 632 +577
dec64table - 32 +32
dec32table - 32 +32
lz4_uncompress 747 - -747
lz4_uncompress_unknownoutputsize 801 - -801
The now inlined lz4_uncompress functions used to have a stack
footprint of 176 bytes (according to -fstack-usage); their inlinees
have increased their stack use from 32 bytes to 48 and 80 bytes,
respectively.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm/page-writeback.c')
0 files changed, 0 insertions, 0 deletions