mirror of
https://github.com/classilla/tenfourfox.git
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183 lines
5.1 KiB
C
183 lines
5.1 KiB
C
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZ_JEMALLOC4
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# error Should only compile this file when building with jemalloc 3
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#endif
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#define MOZ_JEMALLOC_IMPL
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#include "mozmemory_wrap.h"
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#include "jemalloc_types.h"
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#include "mozilla/Types.h"
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#include <stdbool.h>
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#if defined(MOZ_NATIVE_JEMALLOC)
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# include MALLOC_H
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#else
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# include "jemalloc/jemalloc.h"
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#endif
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/*
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* CTL_* macros are from memory/jemalloc/src/src/stats.c with changes:
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* - drop `t' argument to avoid redundancy in calculating type size
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* - require `i' argument for arena number explicitly
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*/
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#define CTL_GET(n, v) do { \
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size_t sz = sizeof(v); \
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je_(mallctl)(n, &v, &sz, NULL, 0); \
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} while (0)
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#define CTL_I_GET(n, v, i) do { \
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size_t mib[6]; \
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size_t miblen = sizeof(mib) / sizeof(mib[0]); \
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size_t sz = sizeof(v); \
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je_(mallctlnametomib)(n, mib, &miblen); \
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mib[2] = i; \
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je_(mallctlbymib)(mib, miblen, &v, &sz, NULL, 0); \
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} while (0)
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#define CTL_IJ_GET(n, v, i, j) do { \
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size_t mib[6]; \
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size_t miblen = sizeof(mib) / sizeof(mib[0]); \
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size_t sz = sizeof(v); \
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je_(mallctlnametomib)(n, mib, &miblen); \
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mib[2] = i; \
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mib[4] = j; \
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je_(mallctlbymib)(mib, miblen, &v, &sz, NULL, 0); \
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} while (0)
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/*
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* VARIABLE_ARRAY is copied from
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* memory/jemalloc/src/include/jemalloc/internal/jemalloc_internal.h.in
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*/
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#if __STDC_VERSION__ < 199901L
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# ifdef _MSC_VER
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# include <malloc.h>
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# define alloca _alloca
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# else
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# ifdef HAVE_ALLOCA_H
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# include <alloca.h>
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# else
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# include <stdlib.h>
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# endif
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# endif
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# define VARIABLE_ARRAY(type, name, count) \
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type *name = alloca(sizeof(type) * (count))
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#else
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# define VARIABLE_ARRAY(type, name, count) type name[(count)]
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#endif
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MOZ_MEMORY_API size_t
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malloc_good_size_impl(size_t size)
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{
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/* je_nallocx crashes when given a size of 0. As
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* malloc_usable_size(malloc(0)) and malloc_usable_size(malloc(1))
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* return the same value, use a size of 1. */
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if (size == 0)
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size = 1;
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return je_(nallocx)(size, 0);
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}
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static void
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compute_bin_unused_and_bookkeeping(jemalloc_stats_t *stats, unsigned int narenas)
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{
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size_t bin_unused = 0;
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uint32_t nregs; // number of regions per run in the j-th bin
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size_t reg_size; // size of regions served by the j-th bin
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size_t curruns; // number of runs belonging to a bin
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size_t curregs; // number of allocated regions in a bin
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unsigned int nbins; // number of bins per arena
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unsigned int i, j;
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size_t stats_metadata;
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size_t stats_ametadata = 0; // total internal allocations in all arenas
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// narenas also counts uninitialized arenas, and initialized arenas
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// are not guaranteed to be adjacent
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VARIABLE_ARRAY(bool, initialized, narenas);
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size_t isz = sizeof(initialized) / sizeof(initialized[0]);
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je_(mallctl)("arenas.initialized", initialized, &isz, NULL, 0);
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CTL_GET("arenas.nbins", nbins);
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for (j = 0; j < nbins; j++) {
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CTL_I_GET("arenas.bin.0.nregs", nregs, j);
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CTL_I_GET("arenas.bin.0.size", reg_size, j);
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for (i = 0; i < narenas; i++) {
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if (!initialized[i]) {
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continue;
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}
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CTL_IJ_GET("stats.arenas.0.bins.0.curruns", curruns, i, j);
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CTL_IJ_GET("stats.arenas.0.bins.0.curregs", curregs, i, j);
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bin_unused += (nregs * curruns - curregs) * reg_size;
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}
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}
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CTL_GET("stats.metadata", stats_metadata);
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/* get the summation for all arenas, i == narenas */
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CTL_I_GET("stats.arenas.0.metadata.allocated", stats_ametadata, narenas);
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stats->bookkeeping = stats_metadata - stats_ametadata;
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stats->bin_unused = bin_unused;
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}
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MOZ_JEMALLOC_API void
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jemalloc_stats_impl(jemalloc_stats_t *stats)
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{
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unsigned narenas;
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size_t active, allocated, mapped, page, pdirty;
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size_t lg_chunk;
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// Refresh jemalloc's stats by updating its epoch, see ctl_refresh in
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// src/ctl.c
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uint64_t epoch = 0;
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size_t esz = sizeof(epoch);
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int ret = je_(mallctl)("epoch", &epoch, &esz, &epoch, esz);
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CTL_GET("arenas.narenas", narenas);
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CTL_GET("arenas.page", page);
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CTL_GET("stats.active", active);
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CTL_GET("stats.allocated", allocated);
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CTL_GET("stats.mapped", mapped);
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CTL_GET("opt.lg_chunk", lg_chunk);
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/* get the summation for all arenas, i == narenas */
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CTL_I_GET("stats.arenas.0.pdirty", pdirty, narenas);
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stats->chunksize = (size_t) 1 << lg_chunk;
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stats->mapped = mapped;
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stats->allocated = allocated;
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stats->waste = active - allocated;
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stats->page_cache = pdirty * page;
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compute_bin_unused_and_bookkeeping(stats, narenas);
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stats->waste -= stats->bin_unused;
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}
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MOZ_JEMALLOC_API void
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jemalloc_purge_freed_pages_impl()
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{
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}
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MOZ_JEMALLOC_API void
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jemalloc_free_dirty_pages_impl()
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{
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unsigned narenas;
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size_t mib[3];
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size_t miblen = sizeof(mib) / sizeof(mib[0]);
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CTL_GET("arenas.narenas", narenas);
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je_(mallctlnametomib)("arena.0.purge", mib, &miblen);
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mib[1] = narenas;
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je_(mallctlbymib)(mib, miblen, NULL, NULL, NULL, 0);
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}
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