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232 lines
6.7 KiB
C++
232 lines
6.7 KiB
C++
/*****************************************************************************
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Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file os/os0proc.cc
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The interface to the operating system
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process control primitives
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Created 9/30/1995 Heikki Tuuri
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*******************************************************/
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#include "os0proc.h"
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#ifdef UNIV_NONINL
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#include "os0proc.ic"
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#endif
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#include "ut0mem.h"
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#include "ut0byte.h"
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/* FreeBSD for example has only MAP_ANON, Linux has MAP_ANONYMOUS and
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MAP_ANON but MAP_ANON is marked as deprecated */
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#if defined(MAP_ANONYMOUS)
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#define OS_MAP_ANON MAP_ANONYMOUS
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#elif defined(MAP_ANON)
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#define OS_MAP_ANON MAP_ANON
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#endif
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UNIV_INTERN ibool os_use_large_pages;
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/* Large page size. This may be a boot-time option on some platforms */
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UNIV_INTERN ulint os_large_page_size;
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/****************************************************************//**
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Converts the current process id to a number. It is not guaranteed that the
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number is unique. In Linux returns the 'process number' of the current
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thread. That number is the same as one sees in 'top', for example. In Linux
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the thread id is not the same as one sees in 'top'.
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@return process id as a number */
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UNIV_INTERN
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ulint
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os_proc_get_number(void)
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/*====================*/
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{
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#ifdef __WIN__
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return((ulint)GetCurrentProcessId());
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#else
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return((ulint) getpid());
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#endif
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}
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/****************************************************************//**
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Allocates large pages memory.
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@return allocated memory */
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UNIV_INTERN
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void*
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os_mem_alloc_large(
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/*===============*/
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ulint* n) /*!< in/out: number of bytes */
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{
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void* ptr;
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ulint size;
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#if defined HAVE_LARGE_PAGES && defined UNIV_LINUX
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int shmid;
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struct shmid_ds buf;
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if (!os_use_large_pages || !os_large_page_size) {
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goto skip;
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}
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/* Align block size to os_large_page_size */
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ut_ad(ut_is_2pow(os_large_page_size));
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size = ut_2pow_round(*n + (os_large_page_size - 1),
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os_large_page_size);
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shmid = shmget(IPC_PRIVATE, (size_t) size, SHM_HUGETLB | SHM_R | SHM_W);
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if (shmid < 0) {
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fprintf(stderr, "InnoDB: HugeTLB: Warning: Failed to allocate"
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" %lu bytes. errno %d\n", size, errno);
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ptr = NULL;
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} else {
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ptr = shmat(shmid, NULL, 0);
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if (ptr == (void*)-1) {
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fprintf(stderr, "InnoDB: HugeTLB: Warning: Failed to"
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" attach shared memory segment, errno %d\n",
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errno);
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ptr = NULL;
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}
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/* Remove the shared memory segment so that it will be
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automatically freed after memory is detached or
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process exits */
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shmctl(shmid, IPC_RMID, &buf);
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}
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if (ptr) {
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*n = size;
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os_fast_mutex_lock(&ut_list_mutex);
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ut_total_allocated_memory += size;
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os_fast_mutex_unlock(&ut_list_mutex);
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UNIV_MEM_ALLOC(ptr, size);
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return(ptr);
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}
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fprintf(stderr, "InnoDB HugeTLB: Warning: Using conventional"
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" memory pool\n");
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skip:
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#endif /* HAVE_LARGE_PAGES && UNIV_LINUX */
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#ifdef __WIN__
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SYSTEM_INFO system_info;
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GetSystemInfo(&system_info);
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/* Align block size to system page size */
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ut_ad(ut_is_2pow(system_info.dwPageSize));
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/* system_info.dwPageSize is only 32-bit. Casting to ulint is required
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on 64-bit Windows. */
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size = *n = ut_2pow_round(*n + (system_info.dwPageSize - 1),
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(ulint) system_info.dwPageSize);
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ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE,
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PAGE_READWRITE);
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if (!ptr) {
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fprintf(stderr, "InnoDB: VirtualAlloc(%lu bytes) failed;"
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" Windows error %lu\n",
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(ulong) size, (ulong) GetLastError());
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} else {
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os_fast_mutex_lock(&ut_list_mutex);
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ut_total_allocated_memory += size;
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os_fast_mutex_unlock(&ut_list_mutex);
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UNIV_MEM_ALLOC(ptr, size);
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}
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#elif !defined OS_MAP_ANON
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size = *n;
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ptr = ut_malloc_low(size, TRUE, FALSE);
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#else
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# ifdef HAVE_GETPAGESIZE
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size = getpagesize();
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# else
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size = UNIV_PAGE_SIZE;
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# endif
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/* Align block size to system page size */
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ut_ad(ut_is_2pow(size));
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size = *n = ut_2pow_round(*n + (size - 1), size);
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ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | OS_MAP_ANON, -1, 0);
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if (UNIV_UNLIKELY(ptr == (void*) -1)) {
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fprintf(stderr, "InnoDB: mmap(%lu bytes) failed;"
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" errno %lu\n",
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(ulong) size, (ulong) errno);
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ptr = NULL;
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} else {
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os_fast_mutex_lock(&ut_list_mutex);
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ut_total_allocated_memory += size;
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os_fast_mutex_unlock(&ut_list_mutex);
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UNIV_MEM_ALLOC(ptr, size);
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}
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#endif
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return(ptr);
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}
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/****************************************************************//**
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Frees large pages memory. */
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UNIV_INTERN
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void
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os_mem_free_large(
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/*==============*/
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void *ptr, /*!< in: pointer returned by
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os_mem_alloc_large() */
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ulint size) /*!< in: size returned by
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os_mem_alloc_large() */
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{
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os_fast_mutex_lock(&ut_list_mutex);
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ut_a(ut_total_allocated_memory >= size);
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os_fast_mutex_unlock(&ut_list_mutex);
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#if defined HAVE_LARGE_PAGES && defined UNIV_LINUX
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if (os_use_large_pages && os_large_page_size && !shmdt(ptr)) {
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os_fast_mutex_lock(&ut_list_mutex);
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ut_a(ut_total_allocated_memory >= size);
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ut_total_allocated_memory -= size;
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os_fast_mutex_unlock(&ut_list_mutex);
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UNIV_MEM_FREE(ptr, size);
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return;
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}
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#endif /* HAVE_LARGE_PAGES && UNIV_LINUX */
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#ifdef __WIN__
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/* When RELEASE memory, the size parameter must be 0.
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Do not use MEM_RELEASE with MEM_DECOMMIT. */
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if (!VirtualFree(ptr, 0, MEM_RELEASE)) {
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fprintf(stderr, "InnoDB: VirtualFree(%p, %lu) failed;"
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" Windows error %lu\n",
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ptr, (ulong) size, (ulong) GetLastError());
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} else {
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os_fast_mutex_lock(&ut_list_mutex);
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ut_a(ut_total_allocated_memory >= size);
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ut_total_allocated_memory -= size;
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os_fast_mutex_unlock(&ut_list_mutex);
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UNIV_MEM_FREE(ptr, size);
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}
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#elif !defined OS_MAP_ANON
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ut_free(ptr);
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#else
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# if defined(UNIV_SOLARIS)
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if (munmap(static_cast<caddr_t>(ptr), size)) {
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# else
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if (munmap(ptr, size)) {
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# endif /* UNIV_SOLARIS */
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fprintf(stderr, "InnoDB: munmap(%p, %lu) failed;"
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" errno %lu\n",
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ptr, (ulong) size, (ulong) errno);
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} else {
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os_fast_mutex_lock(&ut_list_mutex);
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ut_a(ut_total_allocated_memory >= size);
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ut_total_allocated_memory -= size;
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os_fast_mutex_unlock(&ut_list_mutex);
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UNIV_MEM_FREE(ptr, size);
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}
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#endif
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}
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