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xo-alloc2: ++ documentation

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This commit is contained in:
Roland Conybeare 2025-12-24 01:29:57 -05:00
commit 0136044ba2
18 changed files with 474 additions and 37 deletions
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23
src/alloc2/DArena.cpp
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@ -81,8 +81,8 @@ namespace xo {
::munmap(aligned_hi, suffix);
}
#ifdef __linux__
if (enable_hugepage_flag) {
#ifdef __linux__
/** linux:
* opt-in to transparent huge pages (THP)
* provided OS configured to support them.
@ -100,8 +100,8 @@ namespace xo {
* Page table has a handful of levels
**/
::madvise(aligned_base, target_z, MADV_HUGEPAGE); // 8.
}
#endif
}
return std::make_pair(aligned_base, aligned_hi);
}
@ -483,6 +483,18 @@ namespace xo {
return mem;
}
void
DArena::establish_initial_guard() noexcept
{
assert(free_ == lo_);
::memset(this->free_,
config_.header_.guard_byte_,
config_.header_.guard_z_);
this->free_ += config_.header_.guard_z_;
}
bool
DArena::expand(size_t target_z) noexcept
{
@ -551,11 +563,7 @@ namespace xo {
if (commit_start == lo_) [[unlikely]] {
/* first expand() for this allocator - start with guard_z_ bytes */
::memset(free_,
config_.header_.guard_byte_,
config_.header_.guard_z_);
free_ += config_.header_.guard_z_;
this->establish_initial_guard();
}
assert(committed_z_ % arena_align_z_ == 0);
@ -568,6 +576,7 @@ namespace xo {
DArena::clear() noexcept
{
this->free_ = lo_;
this->establish_initial_guard();
}
}
} /*namespace xo*/