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Small changes (#159)

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* Use NoZero for fresh pages
* MADV_DONTNEED only use for greater than a whole slab
* Simplify free list threading code
This commit is contained in:
Matthew Parkinson
2020-04-02 07:04:03 +01:00
committed by GitHub
parent d900e29424
commit 06eef5c4c5
3 changed files with 24 additions and 38 deletions
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10
src/pal/pal_linux.h
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@@ -37,11 +37,15 @@ namespace snmalloc
template<bool page_aligned = false>
void zero(void* p, size_t size) noexcept
{
// QEMU does not seem to be giving the desired behaviour for MADV_DONTNEED.
// switch back to memset only for QEMU.
// QEMU does not seem to be giving the desired behaviour for
// MADV_DONTNEED. switch back to memset only for QEMU.
# ifndef SNMALLOC_QEMU_WORKAROUND
if (page_aligned || is_aligned_block<OS_PAGE_SIZE>(p, size))
if (
(page_aligned || is_aligned_block<OS_PAGE_SIZE>(p, size)) &&
(size > SLAB_SIZE))
{
// Only use this on large allocations as memset faster, and doesn't
// introduce IPI so faster for small allocations.
SNMALLOC_ASSERT(is_aligned_block<OS_PAGE_SIZE>(p, size));
madvise(p, size, MADV_DONTNEED);
}