graphene/LibOS/shim/src/shim_malloc.c

/* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
/* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */

/* Copyright (C) 2014 OSCAR lab, Stony Brook University
   This file is part of Graphene Library OS.

   Graphene Library OS is free software: you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation, either version 3 of the
   License, or (at your option) any later version.

   Graphene Library OS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/*
 * shim_malloc.c
 *
 * This file contains codes for SLAB memory allocator of library OS.
 */

#include <shim_internal.h>
#include <shim_utils.h>
#include <shim_profile.h>
#include <shim_checkpoint.h>
#include <shim_vma.h>

#include <pal.h>
#include <pal_debug.h>

static LOCKTYPE slab_mgr_lock;

#define system_lock()       lock(slab_mgr_lock)
#define system_unlock()     unlock(slab_mgr_lock)
#define PAGE_SIZE           allocsize

#ifdef SLAB_DEBUG_TRACE
# define SLAB_DEBUG
#endif

#define SLAB_CANARY

#include <slabmgr.h>

static SLAB_MGR slab_mgr = NULL;

#define MIN_SHIM_HEAP_PAGES      64
#define MAX_SHIM_HEAP_AREAS      32

#define INIT_SHIM_HEAP     256 * allocsize

static struct shim_heap {
    void * start;
    void * current;
    void * end;
} shim_heap_areas[MAX_SHIM_HEAP_AREAS];

static LOCKTYPE shim_heap_lock;

DEFINE_PROFILE_CATAGORY(memory, );

static struct shim_heap * __alloc_enough_heap (size_t size)
{
    struct shim_heap * heap = NULL, * first_empty = NULL, * smallest = NULL;
    size_t smallest_size = 0;

    for (int i = 0 ; i < MAX_SHIM_HEAP_AREAS ; i++)
        if (shim_heap_areas[i].start) {
            if (shim_heap_areas[i].end >= shim_heap_areas[i].current + size)
                return &shim_heap_areas[i];

            if (!smallest ||
                shim_heap_areas[i].end <=
                shim_heap_areas[i].current + smallest_size) {
                smallest = &shim_heap_areas[i];
                smallest_size = shim_heap_areas[i].end -
                                shim_heap_areas[i].current;
            }
        } else {
            if (!first_empty)
                first_empty = &shim_heap_areas[i];
        }

    if (!heap) {
        size_t heap_size = MIN_SHIM_HEAP_PAGES * allocsize;
        void * start = NULL;
        heap = first_empty ? : smallest;
        assert(heap);

        while (size > heap_size)
            heap_size *= 2;

        if (!(start = DkVirtualMemoryAlloc(NULL, heap_size, 0,
                                           PAL_PROT_WRITE|PAL_PROT_READ)))
            return NULL;

        debug("allocate internal heap at %p - %p\n", start, start + heap_size);

        if (heap == smallest && heap->current != heap->end) {
            DkVirtualMemoryFree(heap->current, heap->end - heap->current);
            int flags = VMA_INTERNAL;
            bkeep_munmap(heap->current, heap->end - heap->current, &flags);
        }

        heap->start = heap->current = start;
        heap->end = start + heap_size;

        unlock(shim_heap_lock);
        bkeep_mmap(start, heap_size, PROT_READ|PROT_WRITE,
                   MAP_PRIVATE|MAP_ANONYMOUS|VMA_INTERNAL, NULL, 0, NULL);
        lock(shim_heap_lock);
    }

    return heap;
}

void * __system_malloc (size_t size)
{
    size_t alloc_size = ALIGN_UP(size);

    lock(shim_heap_lock);

    struct shim_heap * heap = __alloc_enough_heap(alloc_size);

    if (!heap) {
        unlock(shim_heap_lock);
        return NULL;
    }

    void * addr = heap->current;
    heap->current += alloc_size;

    unlock(shim_heap_lock);

    return addr;
}

void __system_free (void * addr, size_t size)
{
    DkVirtualMemoryFree(addr, ALIGN_UP(size));
    int flags = VMA_INTERNAL;
    bkeep_munmap(addr, ALIGN_UP(size), &flags);
}

int init_heap (void)
{
    create_lock(shim_heap_lock);

    void * start = DkVirtualMemoryAlloc(NULL, INIT_SHIM_HEAP, 0,
                                        PAL_PROT_WRITE|PAL_PROT_READ);
    if (!start)
        return -ENOMEM;

    debug("allocate internal heap at %p - %p\n", start,
          start + INIT_SHIM_HEAP);

    shim_heap_areas[0].start = shim_heap_areas[0].current = start;
    shim_heap_areas[0].end = start + INIT_SHIM_HEAP;

    return 0;
}

int bkeep_shim_heap (void)
{
    lock(shim_heap_lock);

    for (int i = 0 ; i < MAX_SHIM_HEAP_AREAS ; i++)
        if (shim_heap_areas[i].start)
            bkeep_mmap(shim_heap_areas[i].start,
                       shim_heap_areas[i].end - shim_heap_areas[i].start,
                       PROT_READ|PROT_WRITE,
                       MAP_PRIVATE|MAP_ANONYMOUS|VMA_INTERNAL, NULL, 0, NULL);

    unlock(shim_heap_lock);
    return 0;
}

int init_slab (void)
{
    create_lock(slab_mgr_lock);
    slab_mgr = create_slab_mgr();
    return 0;
}

extern_alias(init_slab);

int reinit_slab (void)
{
    if (slab_mgr) {
        destroy_slab_mgr(slab_mgr);
        slab_mgr = NULL;
    }
    return 0;
}

DEFINE_PROFILE_OCCURENCE(malloc_0, memory);
DEFINE_PROFILE_OCCURENCE(malloc_1, memory);
DEFINE_PROFILE_OCCURENCE(malloc_2, memory);
DEFINE_PROFILE_OCCURENCE(malloc_3, memory);
DEFINE_PROFILE_OCCURENCE(malloc_4, memory);
DEFINE_PROFILE_OCCURENCE(malloc_5, memory);
DEFINE_PROFILE_OCCURENCE(malloc_6, memory);
DEFINE_PROFILE_OCCURENCE(malloc_7, memory);
DEFINE_PROFILE_OCCURENCE(malloc_big, memory);

#if defined(SLAB_DEBUG_PRINT) || defined(SLABD_DEBUG_TRACE)
void * __malloc_debug (size_t size, const char * file, int line)
#else
void * malloc (size_t size)
#endif
{
#ifdef PROFILE
    int i;
    int level = -1;

    for (i = 0 ; i < SLAB_LEVEL ; i++)
        if (size < slab_levels[i]) {
            level = i;
            break;
        }
    switch(level) {
    case 0:
        INC_PROFILE_OCCURENCE(malloc_0);
        break;
    case 1:
        INC_PROFILE_OCCURENCE(malloc_1);
        break;
    case 2:
        INC_PROFILE_OCCURENCE(malloc_2);
        break;
    case 3:
        INC_PROFILE_OCCURENCE(malloc_3);
        break;
    case 4:
        INC_PROFILE_OCCURENCE(malloc_4);
        break;
    case 5:
        INC_PROFILE_OCCURENCE(malloc_5);
        break;
    case 6:
        INC_PROFILE_OCCURENCE(malloc_6);
        break;
    case 7:
        INC_PROFILE_OCCURENCE(malloc_7);
        break;
    case -1:
        INC_PROFILE_OCCURENCE(malloc_big);
        break;
    }
#endif

#ifdef SLAB_DEBUG_TRACE
    void * mem = slab_alloc_debug(slab_mgr, size, file, line);
#else
    void * mem = slab_alloc(slab_mgr, size);
#endif

#ifdef SLAB_DEBUG_PRINT
    debug("malloc(%d) = %p (%s:%d)\n", size, mem, file, line);
#endif
    return mem;
}
#if !defined(SLAB_DEBUG_PRINT) && !defined(SLAB_DEBUG_TRACE)
extern_alias(malloc);
#endif

#if defined(SLAB_DEBUG_PRINT) || defined(SLABD_DEBUG_TRACE)
void * __remalloc_debug (const void * mem, size_t size,
                   const char * file, int line)
#else
void * remalloc (const void * mem, size_t size)
#endif
{
#if defined(SLAB_DEBUG_PRINT) || defined(SLABD_DEBUG_TRACE)
    void * buff = __malloc_debug(size, file, line);
#else
    void * buff = malloc(size);
#endif
    if (buff)
        memcpy(buff, mem, size);
    return buff;
}
#if !defined(SLAB_DEBUG_PRINT) && !defined(SLABD_DEBUG_TRACE)
extern_alias(remalloc);
#endif

DEFINE_PROFILE_OCCURENCE(free_0, memory);
DEFINE_PROFILE_OCCURENCE(free_1, memory);
DEFINE_PROFILE_OCCURENCE(free_2, memory);
DEFINE_PROFILE_OCCURENCE(free_3, memory);
DEFINE_PROFILE_OCCURENCE(free_4, memory);
DEFINE_PROFILE_OCCURENCE(free_5, memory);
DEFINE_PROFILE_OCCURENCE(free_6, memory);
DEFINE_PROFILE_OCCURENCE(free_7, memory);
DEFINE_PROFILE_OCCURENCE(free_big, memory);
DEFINE_PROFILE_OCCURENCE(free_migrated, memory);

#if defined(SLAB_DEBUG_PRINT) || defined(SLABD_DEBUG_TRACE)
void __free_debug (void * mem, const char * file, int line)
#else
void free (void * mem)
#endif
{
    if (MEMORY_MIGRATED(mem)) {
        INC_PROFILE_OCCURENCE(free_migrated);
        return;
    }

#ifdef PROFILE
    int level = RAW_TO_LEVEL(mem);
    switch(level) {
    case 0:
        INC_PROFILE_OCCURENCE(free_0);
        break;
    case 1:
        INC_PROFILE_OCCURENCE(free_1);
        break;
    case 2:
        INC_PROFILE_OCCURENCE(free_2);
        break;
    case 3:
        INC_PROFILE_OCCURENCE(free_3);
        break;
    case 4:
        INC_PROFILE_OCCURENCE(free_4);
        break;
    case 5:
        INC_PROFILE_OCCURENCE(free_5);
        break;
    case 6:
        INC_PROFILE_OCCURENCE(free_6);
        break;
    case 7:
        INC_PROFILE_OCCURENCE(free_7);
        break;
    case -1:
    case 255:
        INC_PROFILE_OCCURENCE(free_big);
        break;
    }
#endif

#ifdef SLAB_DEBUG_PRINT
    debug("free(%p) (%s:%d)\n", mem, file, line);
#endif

#ifdef SLAB_DEBUG_TRACE
    slab_free_debug(slab_mgr, mem, file, line);
#else
    slab_free(slab_mgr, mem);
#endif
}
#if !defined(SLAB_DEBUG_PRINT) && !defined(SLABD_DEBUG_TRACE)
extern_alias(free);
#endif