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ircd::allocator: Add trapdoor on size and alignment for hugepage advise.

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This commit is contained in:
Jason Volk 2021-02-10 01:23:15 -08:00
parent 9417659367
commit d338e589f5
1 changed files with 42 additions and 0 deletions
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42
ircd/allocator.cc
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@ -19,6 +19,11 @@
//
// #define RB_PROF_ALLOC
namespace ircd::allocator
{
static void advise_hugepage(void *const &, const size_t &alignment, const size_t &size);
}
std::unique_ptr<char, decltype(&std::free)>
ircd::allocator::aligned_alloc(const size_t &alignment_,
const size_t &size_)
@ -61,6 +66,9 @@ ircd::allocator::aligned_alloc(const size_t &alignment_,
assert(ret != nullptr);
assert(uintptr_t(ret) % alignment == 0);
if(likely(info::thp_size))
advise_hugepage(ret, alignment, size);
#ifdef RB_PROF_ALLOC
auto &this_thread(ircd::allocator::profile::this_thread);
this_thread.alloc_bytes += size;
@ -73,6 +81,40 @@ ircd::allocator::aligned_alloc(const size_t &alignment_,
};
}
void
ircd::allocator::advise_hugepage(void *const &ptr,
const size_t &alignment,
const size_t &size)
#if defined(MADV_HUGEPAGE)
try
{
if(likely(alignment < info::thp_size))
return;
if(likely(alignment % size_t(info::thp_size) != 0))
return;
if(!has(info::thp_enable, "[madvise]"))
return;
sys::call(::madvise, ptr, size, MADV_HUGEPAGE);
}
catch(const std::exception &e)
{
log::critical
{
"Failed to madvise(%p, %zu, MADV_HUGEPAGE) :%s",
ptr,
size,
e.what(),
};
}
#else
{
}
#endif
size_t
ircd::allocator::incore(const const_buffer &buf)
{