2013-01-04 14:54:49 +01:00
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/*
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2017-01-17 11:54:55 +01:00
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* Copyright (C) 2013-2017 Max Kellermann <max.kellermann@gmail.com>
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2013-01-04 14:54:49 +01:00
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*
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2014-02-10 13:32:34 +01:00
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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2013-01-04 14:54:49 +01:00
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*
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2014-02-10 13:32:34 +01:00
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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2013-01-04 14:54:49 +01:00
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*
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2014-02-10 13:32:34 +01:00
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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2013-01-04 14:54:49 +01:00
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*/
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#include "HugeAllocator.hxx"
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2017-01-04 10:32:21 +01:00
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#include <new>
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2013-01-04 14:54:49 +01:00
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#ifdef __linux__
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#include <sys/mman.h>
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#include <unistd.h>
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#else
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#include <stdlib.h>
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#endif
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#ifdef __linux__
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/**
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* Round up the parameter, make it page-aligned.
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*/
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gcc_const
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static size_t
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2017-05-08 14:44:49 +02:00
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AlignToPageSize(size_t size) noexcept
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2013-01-04 14:54:49 +01:00
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{
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static const long page_size = sysconf(_SC_PAGESIZE);
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2017-03-01 21:50:26 +01:00
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if (page_size <= 0)
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2013-01-04 14:54:49 +01:00
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return size;
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size_t ps(page_size);
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return (size + ps - 1) / ps * ps;
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}
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2017-09-21 20:31:03 +02:00
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WritableBuffer<void>
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2017-01-04 10:32:21 +01:00
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HugeAllocate(size_t size)
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2013-01-04 14:54:49 +01:00
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{
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size = AlignToPageSize(size);
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constexpr int flags = MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE;
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void *p = mmap(nullptr, size,
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PROT_READ|PROT_WRITE, flags,
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-1, 0);
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if (p == (void *)-1)
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2016-06-17 17:44:45 +02:00
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throw std::bad_alloc();
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2013-01-04 14:54:49 +01:00
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#ifdef MADV_HUGEPAGE
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/* allow the Linux kernel to use "Huge Pages", which reduces page
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table overhead for this big chunk of data */
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madvise(p, size, MADV_HUGEPAGE);
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#endif
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2017-09-21 20:31:03 +02:00
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return {p, size};
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2013-01-04 14:54:49 +01:00
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}
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void
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2016-06-17 17:51:27 +02:00
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HugeFree(void *p, size_t size) noexcept
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2013-01-04 14:54:49 +01:00
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{
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munmap(p, AlignToPageSize(size));
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}
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2017-09-19 19:52:02 +02:00
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void
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HugeForkCow(void *p, size_t size, bool enable) noexcept
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{
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#ifdef MADV_DONTFORK
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madvise(p, AlignToPageSize(size),
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enable ? MADV_DOFORK : MADV_DONTFORK);
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#endif
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}
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2013-01-04 14:54:49 +01:00
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void
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2016-06-17 17:51:27 +02:00
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HugeDiscard(void *p, size_t size) noexcept
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2013-01-04 14:54:49 +01:00
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{
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#ifdef MADV_DONTNEED
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madvise(p, AlignToPageSize(size), MADV_DONTNEED);
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#endif
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}
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2017-12-12 10:22:20 +01:00
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#elif defined(_WIN32)
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2016-06-17 17:44:45 +02:00
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2017-09-21 20:31:03 +02:00
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WritableBuffer<void>
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2017-01-04 10:32:21 +01:00
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HugeAllocate(size_t size)
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2016-06-17 17:44:45 +02:00
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{
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// TODO: use MEM_LARGE_PAGES
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void *p = VirtualAlloc(nullptr, size,
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MEM_COMMIT|MEM_RESERVE,
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PAGE_READWRITE);
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if (p == nullptr)
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throw std::bad_alloc();
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2017-09-21 20:31:03 +02:00
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// TODO: round size up to the page size
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return {p, size};
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2016-06-17 17:44:45 +02:00
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}
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2013-01-04 14:54:49 +01:00
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#endif
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