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194 lines
7.1 KiB
C++
194 lines
7.1 KiB
C++
/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
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// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
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#ident "$Id: memory.cc 52238 2013-01-18 20:21:22Z zardosht $"
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/*
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COPYING CONDITIONS NOTICE:
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation, and provided that the
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following conditions are met:
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* Redistributions of source code must retain this COPYING
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CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
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PATENT MARKING NOTICE (below), and the PATENT RIGHTS
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GRANT (below).
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* Redistributions in binary form must reproduce this COPYING
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CONDITIONS NOTICE, the COPYRIGHT NOTICE (below), the
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DISCLAIMER (below), the UNIVERSITY PATENT NOTICE (below), the
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PATENT MARKING NOTICE (below), and the PATENT RIGHTS
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GRANT (below) in the documentation and/or other materials
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provided with the distribution.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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COPYRIGHT NOTICE:
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TokuDB, Tokutek Fractal Tree Indexing Library.
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Copyright (C) 2007-2013 Tokutek, Inc.
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DISCLAIMER:
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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UNIVERSITY PATENT NOTICE:
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The technology is licensed by the Massachusetts Institute of
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Technology, Rutgers State University of New Jersey, and the Research
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Foundation of State University of New York at Stony Brook under
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United States of America Serial No. 11/760379 and to the patents
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and/or patent applications resulting from it.
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PATENT MARKING NOTICE:
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This software is covered by US Patent No. 8,185,551.
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This software is covered by US Patent No. 8,489,638.
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PATENT RIGHTS GRANT:
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"THIS IMPLEMENTATION" means the copyrightable works distributed by
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Tokutek as part of the Fractal Tree project.
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"PATENT CLAIMS" means the claims of patents that are owned or
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licensable by Tokutek, both currently or in the future; and that in
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the absence of this license would be infringed by THIS
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IMPLEMENTATION or by using or running THIS IMPLEMENTATION.
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"PATENT CHALLENGE" shall mean a challenge to the validity,
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patentability, enforceability and/or non-infringement of any of the
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PATENT CLAIMS or otherwise opposing any of the PATENT CLAIMS.
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Tokutek hereby grants to you, for the term and geographical scope of
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the PATENT CLAIMS, a non-exclusive, no-charge, royalty-free,
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irrevocable (except as stated in this section) patent license to
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make, have made, use, offer to sell, sell, import, transfer, and
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otherwise run, modify, and propagate the contents of THIS
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IMPLEMENTATION, where such license applies only to the PATENT
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CLAIMS. This grant does not include claims that would be infringed
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only as a consequence of further modifications of THIS
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IMPLEMENTATION. If you or your agent or licensee institute or order
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or agree to the institution of patent litigation against any entity
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(including a cross-claim or counterclaim in a lawsuit) alleging that
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THIS IMPLEMENTATION constitutes direct or contributory patent
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infringement, or inducement of patent infringement, then any rights
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granted to you under this License shall terminate as of the date
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such litigation is filed. If you or your agent or exclusive
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licensee institute or order or agree to the institution of a PATENT
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CHALLENGE, then Tokutek may terminate any rights granted to you
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under this License.
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*/
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#ident "Copyright (c) 2007-2013 Tokutek Inc. All rights reserved."
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <toku_include/toku_assert.h>
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#include <toku_include/toku_os.h>
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static bool check_huge_pages_config_file(const char *fname)
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// Effect: Return true if huge pages are there. If so, print diagnostics.
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{
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bool huge_pages_enabled = false;
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FILE *f = fopen(fname, "r");
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if (f) {
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// It's redhat and the feature appears to be there. Is it enabled?
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char buf[1000];
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char *r = fgets(buf, sizeof(buf), f);
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assert(r != NULL);
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if (strstr(buf, "[always]")) {
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fprintf(stderr, "Transparent huge pages are enabled, according to %s\n", fname);
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huge_pages_enabled = true;
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} else {
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huge_pages_enabled =false;
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}
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fclose(f);
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}
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return huge_pages_enabled;
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}
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static bool check_huge_pages_in_practice(void)
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// Effect: Return true if huge pages appear to be defined in practice.
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{
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#ifdef HAVE_MINCORE
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#ifdef HAVE_MAP_ANONYMOUS
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const int map_anonymous = MAP_ANONYMOUS;
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#else
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const int map_anonymous = MAP_ANON;
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#endif
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const size_t TWO_MB = 2UL*1024UL*1024UL;
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void *first = mmap(NULL, 2*TWO_MB, PROT_READ|PROT_WRITE, MAP_PRIVATE|map_anonymous, -1, 0);
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if ((long)first==-1) perror("mmap failed");
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{
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int r = munmap(first, 2*TWO_MB);
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assert(r==0);
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}
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void *second_addr = (void*)(((unsigned long)first + TWO_MB) & ~(TWO_MB -1));
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void *second = mmap(second_addr, TWO_MB, PROT_READ|PROT_WRITE, MAP_FIXED|MAP_PRIVATE|map_anonymous, -1, 0);
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if ((long)second==-1) perror("mmap failed");
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assert((long)second%TWO_MB == 0);
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const long pagesize = 4096;
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const long n_pages = TWO_MB/pagesize;
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unsigned char vec[n_pages];
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{
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int r = mincore(second, TWO_MB, vec);
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if (r!=0 && errno==ENOMEM) {
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// On some kernels (e.g., Centos 5.8), mincore doesn't work. It seems unlikely that huge pages are here.
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munmap(second, TWO_MB);
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return false;
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}
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assert(r==0);
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}
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for (long i=0; i<n_pages; i++) {
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assert(!vec[i]);
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}
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((char*)second)[0] = 1;
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{
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int r = mincore(second, TWO_MB, vec);
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// If the mincore worked the first time, it probably works here too.x
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assert(r==0);
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}
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assert(vec[0]);
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{
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int r = munmap(second, TWO_MB);
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assert(r==0);
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}
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if (vec[1]) {
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fprintf(stderr, "Transparent huge pages appear to be enabled according to mincore()\n");
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return true;
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} else {
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return false;
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}
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#else
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// No mincore, so no way to check this in practice
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return false;
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#endif
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}
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bool toku_os_huge_pages_enabled(void)
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// Effect: Return true if huge pages appear to be enabled. If so, print some diagnostics to stderr.
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// If environment variable TOKU_HUGE_PAGES_OK is set, then don't complain.
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{
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char *toku_huge_pages_ok = getenv("TOKU_HUGE_PAGES_OK");
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if (toku_huge_pages_ok) {
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return false;
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} else {
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bool conf1 = check_huge_pages_config_file("/sys/kernel/mm/redhat_transparent_hugepage/enabled");
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bool conf2 = check_huge_pages_config_file("/sys/kernel/mm/transparent_hugepage/enabled");
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bool prac = check_huge_pages_in_practice();
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return conf1|conf2|prac;
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}
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}
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