mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 23:46:42 +07:00
52b4b950b5
When slub_debug alloc_calls_show is enabled we will try to track location and user of slab object on each online node, kmem_cache_node structure and cpu_cache/cpu_slub shouldn't be freed till there is the last reference to sysfs file. This fixes the following panic: BUG: unable to handle kernel NULL pointer dereference at 0000000000000020 IP: list_locations+0x169/0x4e0 PGD 257304067 PUD 438456067 PMD 0 Oops: 0000 [#1] SMP CPU: 3 PID: 973074 Comm: cat ve: 0 Not tainted 3.10.0-229.7.2.ovz.9.30-00007-japdoll-dirty #2 9.30 Hardware name: DEPO Computers To Be Filled By O.E.M./H67DE3, BIOS L1.60c 07/14/2011 task: ffff88042a5dc5b0 ti: ffff88037f8d8000 task.ti: ffff88037f8d8000 RIP: list_locations+0x169/0x4e0 Call Trace: alloc_calls_show+0x1d/0x30 slab_attr_show+0x1b/0x30 sysfs_read_file+0x9a/0x1a0 vfs_read+0x9c/0x170 SyS_read+0x58/0xb0 system_call_fastpath+0x16/0x1b Code: 5e 07 12 00 b9 00 04 00 00 3d 00 04 00 00 0f 4f c1 3d 00 04 00 00 89 45 b0 0f 84 c3 00 00 00 48 63 45 b0 49 8b 9c c4 f8 00 00 00 <48> 8b 43 20 48 85 c0 74 b6 48 89 df e8 46 37 44 00 48 8b 53 10 CR2: 0000000000000020 Separated __kmem_cache_release from __kmem_cache_shutdown which now called on slab_kmem_cache_release (after the last reference to sysfs file object has dropped). Reintroduced locking in free_partial as sysfs file might access cache's partial list after shutdowning - partial revert of the commit69cb8e6b7c
("slub: free slabs without holding locks"). Zap __remove_partial and use remove_partial (w/o underscores) as free_partial now takes list_lock which s partial revert for commit1e4dd9461f
("slub: do not assert not having lock in removing freed partial") Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com> Suggested-by: Vladimir Davydov <vdavydov@virtuozzo.com> Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
659 lines
16 KiB
C
659 lines
16 KiB
C
/*
|
|
* SLOB Allocator: Simple List Of Blocks
|
|
*
|
|
* Matt Mackall <mpm@selenic.com> 12/30/03
|
|
*
|
|
* NUMA support by Paul Mundt, 2007.
|
|
*
|
|
* How SLOB works:
|
|
*
|
|
* The core of SLOB is a traditional K&R style heap allocator, with
|
|
* support for returning aligned objects. The granularity of this
|
|
* allocator is as little as 2 bytes, however typically most architectures
|
|
* will require 4 bytes on 32-bit and 8 bytes on 64-bit.
|
|
*
|
|
* The slob heap is a set of linked list of pages from alloc_pages(),
|
|
* and within each page, there is a singly-linked list of free blocks
|
|
* (slob_t). The heap is grown on demand. To reduce fragmentation,
|
|
* heap pages are segregated into three lists, with objects less than
|
|
* 256 bytes, objects less than 1024 bytes, and all other objects.
|
|
*
|
|
* Allocation from heap involves first searching for a page with
|
|
* sufficient free blocks (using a next-fit-like approach) followed by
|
|
* a first-fit scan of the page. Deallocation inserts objects back
|
|
* into the free list in address order, so this is effectively an
|
|
* address-ordered first fit.
|
|
*
|
|
* Above this is an implementation of kmalloc/kfree. Blocks returned
|
|
* from kmalloc are prepended with a 4-byte header with the kmalloc size.
|
|
* If kmalloc is asked for objects of PAGE_SIZE or larger, it calls
|
|
* alloc_pages() directly, allocating compound pages so the page order
|
|
* does not have to be separately tracked.
|
|
* These objects are detected in kfree() because PageSlab()
|
|
* is false for them.
|
|
*
|
|
* SLAB is emulated on top of SLOB by simply calling constructors and
|
|
* destructors for every SLAB allocation. Objects are returned with the
|
|
* 4-byte alignment unless the SLAB_HWCACHE_ALIGN flag is set, in which
|
|
* case the low-level allocator will fragment blocks to create the proper
|
|
* alignment. Again, objects of page-size or greater are allocated by
|
|
* calling alloc_pages(). As SLAB objects know their size, no separate
|
|
* size bookkeeping is necessary and there is essentially no allocation
|
|
* space overhead, and compound pages aren't needed for multi-page
|
|
* allocations.
|
|
*
|
|
* NUMA support in SLOB is fairly simplistic, pushing most of the real
|
|
* logic down to the page allocator, and simply doing the node accounting
|
|
* on the upper levels. In the event that a node id is explicitly
|
|
* provided, __alloc_pages_node() with the specified node id is used
|
|
* instead. The common case (or when the node id isn't explicitly provided)
|
|
* will default to the current node, as per numa_node_id().
|
|
*
|
|
* Node aware pages are still inserted in to the global freelist, and
|
|
* these are scanned for by matching against the node id encoded in the
|
|
* page flags. As a result, block allocations that can be satisfied from
|
|
* the freelist will only be done so on pages residing on the same node,
|
|
* in order to prevent random node placement.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h> /* struct reclaim_state */
|
|
#include <linux/cache.h>
|
|
#include <linux/init.h>
|
|
#include <linux/export.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/list.h>
|
|
#include <linux/kmemleak.h>
|
|
|
|
#include <trace/events/kmem.h>
|
|
|
|
#include <linux/atomic.h>
|
|
|
|
#include "slab.h"
|
|
/*
|
|
* slob_block has a field 'units', which indicates size of block if +ve,
|
|
* or offset of next block if -ve (in SLOB_UNITs).
|
|
*
|
|
* Free blocks of size 1 unit simply contain the offset of the next block.
|
|
* Those with larger size contain their size in the first SLOB_UNIT of
|
|
* memory, and the offset of the next free block in the second SLOB_UNIT.
|
|
*/
|
|
#if PAGE_SIZE <= (32767 * 2)
|
|
typedef s16 slobidx_t;
|
|
#else
|
|
typedef s32 slobidx_t;
|
|
#endif
|
|
|
|
struct slob_block {
|
|
slobidx_t units;
|
|
};
|
|
typedef struct slob_block slob_t;
|
|
|
|
/*
|
|
* All partially free slob pages go on these lists.
|
|
*/
|
|
#define SLOB_BREAK1 256
|
|
#define SLOB_BREAK2 1024
|
|
static LIST_HEAD(free_slob_small);
|
|
static LIST_HEAD(free_slob_medium);
|
|
static LIST_HEAD(free_slob_large);
|
|
|
|
/*
|
|
* slob_page_free: true for pages on free_slob_pages list.
|
|
*/
|
|
static inline int slob_page_free(struct page *sp)
|
|
{
|
|
return PageSlobFree(sp);
|
|
}
|
|
|
|
static void set_slob_page_free(struct page *sp, struct list_head *list)
|
|
{
|
|
list_add(&sp->lru, list);
|
|
__SetPageSlobFree(sp);
|
|
}
|
|
|
|
static inline void clear_slob_page_free(struct page *sp)
|
|
{
|
|
list_del(&sp->lru);
|
|
__ClearPageSlobFree(sp);
|
|
}
|
|
|
|
#define SLOB_UNIT sizeof(slob_t)
|
|
#define SLOB_UNITS(size) DIV_ROUND_UP(size, SLOB_UNIT)
|
|
|
|
/*
|
|
* struct slob_rcu is inserted at the tail of allocated slob blocks, which
|
|
* were created with a SLAB_DESTROY_BY_RCU slab. slob_rcu is used to free
|
|
* the block using call_rcu.
|
|
*/
|
|
struct slob_rcu {
|
|
struct rcu_head head;
|
|
int size;
|
|
};
|
|
|
|
/*
|
|
* slob_lock protects all slob allocator structures.
|
|
*/
|
|
static DEFINE_SPINLOCK(slob_lock);
|
|
|
|
/*
|
|
* Encode the given size and next info into a free slob block s.
|
|
*/
|
|
static void set_slob(slob_t *s, slobidx_t size, slob_t *next)
|
|
{
|
|
slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK);
|
|
slobidx_t offset = next - base;
|
|
|
|
if (size > 1) {
|
|
s[0].units = size;
|
|
s[1].units = offset;
|
|
} else
|
|
s[0].units = -offset;
|
|
}
|
|
|
|
/*
|
|
* Return the size of a slob block.
|
|
*/
|
|
static slobidx_t slob_units(slob_t *s)
|
|
{
|
|
if (s->units > 0)
|
|
return s->units;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Return the next free slob block pointer after this one.
|
|
*/
|
|
static slob_t *slob_next(slob_t *s)
|
|
{
|
|
slob_t *base = (slob_t *)((unsigned long)s & PAGE_MASK);
|
|
slobidx_t next;
|
|
|
|
if (s[0].units < 0)
|
|
next = -s[0].units;
|
|
else
|
|
next = s[1].units;
|
|
return base+next;
|
|
}
|
|
|
|
/*
|
|
* Returns true if s is the last free block in its page.
|
|
*/
|
|
static int slob_last(slob_t *s)
|
|
{
|
|
return !((unsigned long)slob_next(s) & ~PAGE_MASK);
|
|
}
|
|
|
|
static void *slob_new_pages(gfp_t gfp, int order, int node)
|
|
{
|
|
void *page;
|
|
|
|
#ifdef CONFIG_NUMA
|
|
if (node != NUMA_NO_NODE)
|
|
page = __alloc_pages_node(node, gfp, order);
|
|
else
|
|
#endif
|
|
page = alloc_pages(gfp, order);
|
|
|
|
if (!page)
|
|
return NULL;
|
|
|
|
return page_address(page);
|
|
}
|
|
|
|
static void slob_free_pages(void *b, int order)
|
|
{
|
|
if (current->reclaim_state)
|
|
current->reclaim_state->reclaimed_slab += 1 << order;
|
|
free_pages((unsigned long)b, order);
|
|
}
|
|
|
|
/*
|
|
* Allocate a slob block within a given slob_page sp.
|
|
*/
|
|
static void *slob_page_alloc(struct page *sp, size_t size, int align)
|
|
{
|
|
slob_t *prev, *cur, *aligned = NULL;
|
|
int delta = 0, units = SLOB_UNITS(size);
|
|
|
|
for (prev = NULL, cur = sp->freelist; ; prev = cur, cur = slob_next(cur)) {
|
|
slobidx_t avail = slob_units(cur);
|
|
|
|
if (align) {
|
|
aligned = (slob_t *)ALIGN((unsigned long)cur, align);
|
|
delta = aligned - cur;
|
|
}
|
|
if (avail >= units + delta) { /* room enough? */
|
|
slob_t *next;
|
|
|
|
if (delta) { /* need to fragment head to align? */
|
|
next = slob_next(cur);
|
|
set_slob(aligned, avail - delta, next);
|
|
set_slob(cur, delta, aligned);
|
|
prev = cur;
|
|
cur = aligned;
|
|
avail = slob_units(cur);
|
|
}
|
|
|
|
next = slob_next(cur);
|
|
if (avail == units) { /* exact fit? unlink. */
|
|
if (prev)
|
|
set_slob(prev, slob_units(prev), next);
|
|
else
|
|
sp->freelist = next;
|
|
} else { /* fragment */
|
|
if (prev)
|
|
set_slob(prev, slob_units(prev), cur + units);
|
|
else
|
|
sp->freelist = cur + units;
|
|
set_slob(cur + units, avail - units, next);
|
|
}
|
|
|
|
sp->units -= units;
|
|
if (!sp->units)
|
|
clear_slob_page_free(sp);
|
|
return cur;
|
|
}
|
|
if (slob_last(cur))
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* slob_alloc: entry point into the slob allocator.
|
|
*/
|
|
static void *slob_alloc(size_t size, gfp_t gfp, int align, int node)
|
|
{
|
|
struct page *sp;
|
|
struct list_head *prev;
|
|
struct list_head *slob_list;
|
|
slob_t *b = NULL;
|
|
unsigned long flags;
|
|
|
|
if (size < SLOB_BREAK1)
|
|
slob_list = &free_slob_small;
|
|
else if (size < SLOB_BREAK2)
|
|
slob_list = &free_slob_medium;
|
|
else
|
|
slob_list = &free_slob_large;
|
|
|
|
spin_lock_irqsave(&slob_lock, flags);
|
|
/* Iterate through each partially free page, try to find room */
|
|
list_for_each_entry(sp, slob_list, lru) {
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* If there's a node specification, search for a partial
|
|
* page with a matching node id in the freelist.
|
|
*/
|
|
if (node != NUMA_NO_NODE && page_to_nid(sp) != node)
|
|
continue;
|
|
#endif
|
|
/* Enough room on this page? */
|
|
if (sp->units < SLOB_UNITS(size))
|
|
continue;
|
|
|
|
/* Attempt to alloc */
|
|
prev = sp->lru.prev;
|
|
b = slob_page_alloc(sp, size, align);
|
|
if (!b)
|
|
continue;
|
|
|
|
/* Improve fragment distribution and reduce our average
|
|
* search time by starting our next search here. (see
|
|
* Knuth vol 1, sec 2.5, pg 449) */
|
|
if (prev != slob_list->prev &&
|
|
slob_list->next != prev->next)
|
|
list_move_tail(slob_list, prev->next);
|
|
break;
|
|
}
|
|
spin_unlock_irqrestore(&slob_lock, flags);
|
|
|
|
/* Not enough space: must allocate a new page */
|
|
if (!b) {
|
|
b = slob_new_pages(gfp & ~__GFP_ZERO, 0, node);
|
|
if (!b)
|
|
return NULL;
|
|
sp = virt_to_page(b);
|
|
__SetPageSlab(sp);
|
|
|
|
spin_lock_irqsave(&slob_lock, flags);
|
|
sp->units = SLOB_UNITS(PAGE_SIZE);
|
|
sp->freelist = b;
|
|
INIT_LIST_HEAD(&sp->lru);
|
|
set_slob(b, SLOB_UNITS(PAGE_SIZE), b + SLOB_UNITS(PAGE_SIZE));
|
|
set_slob_page_free(sp, slob_list);
|
|
b = slob_page_alloc(sp, size, align);
|
|
BUG_ON(!b);
|
|
spin_unlock_irqrestore(&slob_lock, flags);
|
|
}
|
|
if (unlikely((gfp & __GFP_ZERO) && b))
|
|
memset(b, 0, size);
|
|
return b;
|
|
}
|
|
|
|
/*
|
|
* slob_free: entry point into the slob allocator.
|
|
*/
|
|
static void slob_free(void *block, int size)
|
|
{
|
|
struct page *sp;
|
|
slob_t *prev, *next, *b = (slob_t *)block;
|
|
slobidx_t units;
|
|
unsigned long flags;
|
|
struct list_head *slob_list;
|
|
|
|
if (unlikely(ZERO_OR_NULL_PTR(block)))
|
|
return;
|
|
BUG_ON(!size);
|
|
|
|
sp = virt_to_page(block);
|
|
units = SLOB_UNITS(size);
|
|
|
|
spin_lock_irqsave(&slob_lock, flags);
|
|
|
|
if (sp->units + units == SLOB_UNITS(PAGE_SIZE)) {
|
|
/* Go directly to page allocator. Do not pass slob allocator */
|
|
if (slob_page_free(sp))
|
|
clear_slob_page_free(sp);
|
|
spin_unlock_irqrestore(&slob_lock, flags);
|
|
__ClearPageSlab(sp);
|
|
page_mapcount_reset(sp);
|
|
slob_free_pages(b, 0);
|
|
return;
|
|
}
|
|
|
|
if (!slob_page_free(sp)) {
|
|
/* This slob page is about to become partially free. Easy! */
|
|
sp->units = units;
|
|
sp->freelist = b;
|
|
set_slob(b, units,
|
|
(void *)((unsigned long)(b +
|
|
SLOB_UNITS(PAGE_SIZE)) & PAGE_MASK));
|
|
if (size < SLOB_BREAK1)
|
|
slob_list = &free_slob_small;
|
|
else if (size < SLOB_BREAK2)
|
|
slob_list = &free_slob_medium;
|
|
else
|
|
slob_list = &free_slob_large;
|
|
set_slob_page_free(sp, slob_list);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Otherwise the page is already partially free, so find reinsertion
|
|
* point.
|
|
*/
|
|
sp->units += units;
|
|
|
|
if (b < (slob_t *)sp->freelist) {
|
|
if (b + units == sp->freelist) {
|
|
units += slob_units(sp->freelist);
|
|
sp->freelist = slob_next(sp->freelist);
|
|
}
|
|
set_slob(b, units, sp->freelist);
|
|
sp->freelist = b;
|
|
} else {
|
|
prev = sp->freelist;
|
|
next = slob_next(prev);
|
|
while (b > next) {
|
|
prev = next;
|
|
next = slob_next(prev);
|
|
}
|
|
|
|
if (!slob_last(prev) && b + units == next) {
|
|
units += slob_units(next);
|
|
set_slob(b, units, slob_next(next));
|
|
} else
|
|
set_slob(b, units, next);
|
|
|
|
if (prev + slob_units(prev) == b) {
|
|
units = slob_units(b) + slob_units(prev);
|
|
set_slob(prev, units, slob_next(b));
|
|
} else
|
|
set_slob(prev, slob_units(prev), b);
|
|
}
|
|
out:
|
|
spin_unlock_irqrestore(&slob_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend.
|
|
*/
|
|
|
|
static __always_inline void *
|
|
__do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
|
|
{
|
|
unsigned int *m;
|
|
int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
|
|
void *ret;
|
|
|
|
gfp &= gfp_allowed_mask;
|
|
|
|
lockdep_trace_alloc(gfp);
|
|
|
|
if (size < PAGE_SIZE - align) {
|
|
if (!size)
|
|
return ZERO_SIZE_PTR;
|
|
|
|
m = slob_alloc(size + align, gfp, align, node);
|
|
|
|
if (!m)
|
|
return NULL;
|
|
*m = size;
|
|
ret = (void *)m + align;
|
|
|
|
trace_kmalloc_node(caller, ret,
|
|
size, size + align, gfp, node);
|
|
} else {
|
|
unsigned int order = get_order(size);
|
|
|
|
if (likely(order))
|
|
gfp |= __GFP_COMP;
|
|
ret = slob_new_pages(gfp, order, node);
|
|
|
|
trace_kmalloc_node(caller, ret,
|
|
size, PAGE_SIZE << order, gfp, node);
|
|
}
|
|
|
|
kmemleak_alloc(ret, size, 1, gfp);
|
|
return ret;
|
|
}
|
|
|
|
void *__kmalloc(size_t size, gfp_t gfp)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, _RET_IP_);
|
|
}
|
|
EXPORT_SYMBOL(__kmalloc);
|
|
|
|
void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller);
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
void *__kmalloc_node_track_caller(size_t size, gfp_t gfp,
|
|
int node, unsigned long caller)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, node, caller);
|
|
}
|
|
#endif
|
|
|
|
void kfree(const void *block)
|
|
{
|
|
struct page *sp;
|
|
|
|
trace_kfree(_RET_IP_, block);
|
|
|
|
if (unlikely(ZERO_OR_NULL_PTR(block)))
|
|
return;
|
|
kmemleak_free(block);
|
|
|
|
sp = virt_to_page(block);
|
|
if (PageSlab(sp)) {
|
|
int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
|
|
unsigned int *m = (unsigned int *)(block - align);
|
|
slob_free(m, *m + align);
|
|
} else
|
|
__free_pages(sp, compound_order(sp));
|
|
}
|
|
EXPORT_SYMBOL(kfree);
|
|
|
|
/* can't use ksize for kmem_cache_alloc memory, only kmalloc */
|
|
size_t ksize(const void *block)
|
|
{
|
|
struct page *sp;
|
|
int align;
|
|
unsigned int *m;
|
|
|
|
BUG_ON(!block);
|
|
if (unlikely(block == ZERO_SIZE_PTR))
|
|
return 0;
|
|
|
|
sp = virt_to_page(block);
|
|
if (unlikely(!PageSlab(sp)))
|
|
return PAGE_SIZE << compound_order(sp);
|
|
|
|
align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
|
|
m = (unsigned int *)(block - align);
|
|
return SLOB_UNITS(*m) * SLOB_UNIT;
|
|
}
|
|
EXPORT_SYMBOL(ksize);
|
|
|
|
int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
|
|
{
|
|
if (flags & SLAB_DESTROY_BY_RCU) {
|
|
/* leave room for rcu footer at the end of object */
|
|
c->size += sizeof(struct slob_rcu);
|
|
}
|
|
c->flags = flags;
|
|
return 0;
|
|
}
|
|
|
|
static void *slob_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
|
|
{
|
|
void *b;
|
|
|
|
flags &= gfp_allowed_mask;
|
|
|
|
lockdep_trace_alloc(flags);
|
|
|
|
if (c->size < PAGE_SIZE) {
|
|
b = slob_alloc(c->size, flags, c->align, node);
|
|
trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
|
|
SLOB_UNITS(c->size) * SLOB_UNIT,
|
|
flags, node);
|
|
} else {
|
|
b = slob_new_pages(flags, get_order(c->size), node);
|
|
trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
|
|
PAGE_SIZE << get_order(c->size),
|
|
flags, node);
|
|
}
|
|
|
|
if (b && c->ctor)
|
|
c->ctor(b);
|
|
|
|
kmemleak_alloc_recursive(b, c->size, 1, c->flags, flags);
|
|
return b;
|
|
}
|
|
|
|
void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
|
|
{
|
|
return slob_alloc_node(cachep, flags, NUMA_NO_NODE);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_alloc);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
void *__kmalloc_node(size_t size, gfp_t gfp, int node)
|
|
{
|
|
return __do_kmalloc_node(size, gfp, node, _RET_IP_);
|
|
}
|
|
EXPORT_SYMBOL(__kmalloc_node);
|
|
|
|
void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t gfp, int node)
|
|
{
|
|
return slob_alloc_node(cachep, gfp, node);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_alloc_node);
|
|
#endif
|
|
|
|
static void __kmem_cache_free(void *b, int size)
|
|
{
|
|
if (size < PAGE_SIZE)
|
|
slob_free(b, size);
|
|
else
|
|
slob_free_pages(b, get_order(size));
|
|
}
|
|
|
|
static void kmem_rcu_free(struct rcu_head *head)
|
|
{
|
|
struct slob_rcu *slob_rcu = (struct slob_rcu *)head;
|
|
void *b = (void *)slob_rcu - (slob_rcu->size - sizeof(struct slob_rcu));
|
|
|
|
__kmem_cache_free(b, slob_rcu->size);
|
|
}
|
|
|
|
void kmem_cache_free(struct kmem_cache *c, void *b)
|
|
{
|
|
kmemleak_free_recursive(b, c->flags);
|
|
if (unlikely(c->flags & SLAB_DESTROY_BY_RCU)) {
|
|
struct slob_rcu *slob_rcu;
|
|
slob_rcu = b + (c->size - sizeof(struct slob_rcu));
|
|
slob_rcu->size = c->size;
|
|
call_rcu(&slob_rcu->head, kmem_rcu_free);
|
|
} else {
|
|
__kmem_cache_free(b, c->size);
|
|
}
|
|
|
|
trace_kmem_cache_free(_RET_IP_, b);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_free);
|
|
|
|
void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)
|
|
{
|
|
__kmem_cache_free_bulk(s, size, p);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_free_bulk);
|
|
|
|
int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
|
|
void **p)
|
|
{
|
|
return __kmem_cache_alloc_bulk(s, flags, size, p);
|
|
}
|
|
EXPORT_SYMBOL(kmem_cache_alloc_bulk);
|
|
|
|
int __kmem_cache_shutdown(struct kmem_cache *c)
|
|
{
|
|
/* No way to check for remaining objects */
|
|
return 0;
|
|
}
|
|
|
|
void __kmem_cache_release(struct kmem_cache *c)
|
|
{
|
|
}
|
|
|
|
int __kmem_cache_shrink(struct kmem_cache *d, bool deactivate)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct kmem_cache kmem_cache_boot = {
|
|
.name = "kmem_cache",
|
|
.size = sizeof(struct kmem_cache),
|
|
.flags = SLAB_PANIC,
|
|
.align = ARCH_KMALLOC_MINALIGN,
|
|
};
|
|
|
|
void __init kmem_cache_init(void)
|
|
{
|
|
kmem_cache = &kmem_cache_boot;
|
|
slab_state = UP;
|
|
}
|
|
|
|
void __init kmem_cache_init_late(void)
|
|
{
|
|
slab_state = FULL;
|
|
}
|