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Revert "Remove BITMAP_USE_TREE."

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Some systems use a native 64 KiB page size, which means that the bitmap
for the smallest size class can be 8192 bits, not just 512 bits as when
the page size is 4 KiB.  Linear search in bitmap_{sfu,ffu}() is
unacceptably slow for such large bitmaps.

This reverts commit 7c00f04ff4.
This commit is contained in:
Jason Evans
2017-04-16 09:25:56 -07:00
parent 38e847c1c5
commit 45f087eb03
5 changed files with 307 additions and 0 deletions
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16
test/unit/bitmap.c
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@@ -103,8 +103,24 @@ test_bitmap_initializer_body(const bitmap_info_t *binfo, size_t nbits) {
assert_zu_eq(binfo->nbits, binfo_dyn.nbits,
"Unexpected difference between static and dynamic initialization, "
"nbits=%zu", nbits);
#ifdef BITMAP_USE_TREE
assert_u_eq(binfo->nlevels, binfo_dyn.nlevels,
"Unexpected difference between static and dynamic initialization, "
"nbits=%zu", nbits);
{
unsigned i;
for (i = 0; i < binfo->nlevels; i++) {
assert_zu_eq(binfo->levels[i].group_offset,
binfo_dyn.levels[i].group_offset,
"Unexpected difference between static and dynamic "
"initialization, nbits=%zu, level=%u", nbits, i);
}
}
#else
assert_zu_eq(binfo->ngroups, binfo_dyn.ngroups,
"Unexpected difference between static and dynamic initialization");
#endif
}
TEST_BEGIN(test_bitmap_initializer) {