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mm: remove __GFP_COLD 

As the page free path makes no distinction between cache hot and cold
pages, there is no real useful ordering of pages in the free list that
allocation requests can take advantage of.  Juding from the users of
__GFP_COLD, it is likely that a number of them are the result of copying
other sites instead of actually measuring the impact.  Remove the
__GFP_COLD parameter which simplifies a number of paths in the page
allocator.

This is potentially controversial but bear in mind that the size of the
per-cpu pagelists versus modern cache sizes means that the whole per-cpu
list can often fit in the L3 cache.  Hence, there is only a potential
benefit for microbenchmarks that alloc/free pages in a tight loop.  It's
even worse when THP is taken into account which has little or no chance
of getting a cache-hot page as the per-cpu list is bypassed and the
zeroing of multiple pages will thrash the cache anyway.

The truncate microbenchmarks are not shown as this patch affects the
allocation path and not the free path.  A page fault microbenchmark was
tested but it showed no sigificant difference which is not surprising
given that the __GFP_COLD branches are a miniscule percentage of the
fault path.

Link: http://lkml.kernel.org/r/20171018075952.10627-9-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Mel Gorman 2017-11-15 17:38:03 -08:00 committed by Linus Torvalds
parent 2d4894b5d2
commit 453f85d43f
25 changed files with 32 additions and 62 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/amazon/ena/ena_netdev.c
View File

@ -517,7 +517,7 @@ static int ena_refill_rx_bufs(struct ena_ring *rx_ring, u32 num)
rc = ena_alloc_rx_page(rx_ring, rx_info,
__GFP_COLD | GFP_ATOMIC | __GFP_COMP);
GFP_ATOMIC | __GFP_COMP);
if (unlikely(rc < 0)) {
netif_warn(rx_ring->adapter, rx_err, rx_ring->netdev,
"failed to alloc buffer for rx queue %d\n",

2
drivers/net/ethernet/amd/xgbe/xgbe-desc.c
View File

@ -295,7 +295,7 @@ again:
order = alloc_order;
/* Try to obtain pages, decreasing order if necessary */
gfp = GFP_ATOMIC | __GFP_COLD | __GFP_COMP | __GFP_NOWARN;
gfp = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN;
while (order >= 0) {
pages = alloc_pages_node(node, gfp, order);
if (pages)

3
drivers/net/ethernet/aquantia/atlantic/aq_ring.c
View File

@ -304,8 +304,7 @@ int aq_ring_rx_fill(struct aq_ring_s *self)
buff->flags = 0U;
buff->len = AQ_CFG_RX_FRAME_MAX;
buff->page = alloc_pages(GFP_ATOMIC | __GFP_COLD |
__GFP_COMP, pages_order);
buff->page = alloc_pages(GFP_ATOMIC | __GFP_COMP, pages_order);
if (!buff->page) {
err = -ENOMEM;
goto err_exit;

2
drivers/net/ethernet/cavium/liquidio/octeon_network.h
View File

@ -195,7 +195,7 @@ static inline void
struct sk_buff *skb;
struct octeon_skb_page_info *skb_pg_info;
page = alloc_page(GFP_ATOMIC | __GFP_COLD);
page = alloc_page(GFP_ATOMIC);
if (unlikely(!page))
return NULL;

5
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View File

@ -193,7 +193,7 @@ static int mlx4_en_fill_rx_buffers(struct mlx4_en_priv *priv)
if (mlx4_en_prepare_rx_desc(priv, ring,
ring->actual_size,
GFP_KERNEL | __GFP_COLD)) {
GFP_KERNEL)) {
if (ring->actual_size < MLX4_EN_MIN_RX_SIZE) {
en_err(priv, "Failed to allocate enough rx buffers\n");
return -ENOMEM;
@ -552,8 +552,7 @@ static void mlx4_en_refill_rx_buffers(struct mlx4_en_priv *priv,
do {
if (mlx4_en_prepare_rx_desc(priv, ring,
ring->prod & ring->size_mask,
GFP_ATOMIC | __GFP_COLD |
__GFP_MEMALLOC))
GFP_ATOMIC | __GFP_MEMALLOC))
break;
ring->prod++;
} while (likely(--missing));

4
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
View File

@ -1185,7 +1185,7 @@ static void *nfp_net_rx_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
} else {
struct page *page;
page = alloc_page(GFP_KERNEL | __GFP_COLD);
page = alloc_page(GFP_KERNEL);
frag = page ? page_address(page) : NULL;
}
if (!frag) {
@ -1212,7 +1212,7 @@ static void *nfp_net_napi_alloc_one(struct nfp_net_dp *dp, dma_addr_t *dma_addr)
} else {
struct page *page;
page = alloc_page(GFP_ATOMIC | __GFP_COLD);
page = alloc_page(GFP_ATOMIC);
frag = page ? page_address(page) : NULL;
}
if (!frag) {

3
drivers/net/ethernet/qlogic/qlge/qlge_main.c
View File

@ -1092,8 +1092,7 @@ static int ql_get_next_chunk(struct ql_adapter *qdev, struct rx_ring *rx_ring,
{
if (!rx_ring->pg_chunk.page) {
u64 map;
rx_ring->pg_chunk.page = alloc_pages(__GFP_COLD | __GFP_COMP |
GFP_ATOMIC,
rx_ring->pg_chunk.page = alloc_pages(__GFP_COMP | GFP_ATOMIC,
qdev->lbq_buf_order);
if (unlikely(!rx_ring->pg_chunk.page)) {
netif_err(qdev, drv, qdev->ndev,

2
drivers/net/ethernet/sfc/falcon/rx.c
View File

@ -163,7 +163,7 @@ static int ef4_init_rx_buffers(struct ef4_rx_queue *rx_queue, bool atomic)
do {
page = ef4_reuse_page(rx_queue);
if (page == NULL) {
page = alloc_pages(__GFP_COLD | __GFP_COMP |
page = alloc_pages(__GFP_COMP |
(atomic ? GFP_ATOMIC : GFP_KERNEL),
efx->rx_buffer_order);
if (unlikely(page == NULL))

2
drivers/net/ethernet/sfc/rx.c
View File

@ -163,7 +163,7 @@ static int efx_init_rx_buffers(struct efx_rx_queue *rx_queue, bool atomic)
do {
page = efx_reuse_page(rx_queue);
if (page == NULL) {
page = alloc_pages(__GFP_COLD | __GFP_COMP |
page = alloc_pages(__GFP_COMP |
(atomic ? GFP_ATOMIC : GFP_KERNEL),
efx->rx_buffer_order);
if (unlikely(page == NULL))

2
drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
View File

@ -335,7 +335,7 @@ static int xlgmac_alloc_pages(struct xlgmac_pdata *pdata,
dma_addr_t pages_dma;
/* Try to obtain pages, decreasing order if necessary */
gfp |= __GFP_COLD | __GFP_COMP | __GFP_NOWARN;
gfp |= __GFP_COMP | __GFP_NOWARN;
while (order >= 0) {
pages = alloc_pages(gfp, order);
if (pages)

2
drivers/net/ethernet/ti/netcp_core.c
View File

@ -906,7 +906,7 @@ static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
sw_data[0] = (u32)bufptr;
} else {
/* Allocate a secondary receive queue entry */
page = alloc_page(GFP_ATOMIC | GFP_DMA | __GFP_COLD);
page = alloc_page(GFP_ATOMIC | GFP_DMA);
if (unlikely(!page)) {
dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
goto fail;

1
drivers/net/virtio_net.c
View File

@ -988,7 +988,6 @@ static bool try_fill_recv(struct virtnet_info *vi, struct receive_queue *rq,
int err;
bool oom;
gfp |= __GFP_COLD;
do {
if (vi->mergeable_rx_bufs)
err = add_recvbuf_mergeable(vi, rq, gfp);

2
drivers/staging/lustre/lustre/mdc/mdc_request.c
View File

@ -1152,7 +1152,7 @@ static int mdc_read_page_remote(void *data, struct page *page0)
}
for (npages = 1; npages < max_pages; npages++) {
page = page_cache_alloc_cold(inode->i_mapping);
page = page_cache_alloc(inode->i_mapping);
if (!page)
break;
page_pool[npages] = page;

6
fs/cachefiles/rdwr.c
View File

@ -256,8 +256,7 @@ static int cachefiles_read_backing_file_one(struct cachefiles_object *object,
goto backing_page_already_present;
if (!newpage) {
newpage = __page_cache_alloc(cachefiles_gfp |
__GFP_COLD);
newpage = __page_cache_alloc(cachefiles_gfp);
if (!newpage)
goto nomem_monitor;
}
@ -493,8 +492,7 @@ static int cachefiles_read_backing_file(struct cachefiles_object *object,
goto backing_page_already_present;
if (!newpage) {
newpage = __page_cache_alloc(cachefiles_gfp |
__GFP_COLD);
newpage = __page_cache_alloc(cachefiles_gfp);
if (!newpage)
goto nomem;
}

5
include/linux/gfp.h
View File

@ -24,7 +24,6 @@ struct vm_area_struct;
#define ___GFP_HIGH 0x20u
#define ___GFP_IO 0x40u
#define ___GFP_FS 0x80u
#define ___GFP_COLD 0x100u
#define ___GFP_NOWARN 0x200u
#define ___GFP_RETRY_MAYFAIL 0x400u
#define ___GFP_NOFAIL 0x800u
@ -192,16 +191,12 @@ struct vm_area_struct;
/*
* Action modifiers
*
* __GFP_COLD indicates that the caller does not expect to be used in the near
* future. Where possible, a cache-cold page will be returned.
*
* __GFP_NOWARN suppresses allocation failure reports.
*
* __GFP_COMP address compound page metadata.
*
* __GFP_ZERO returns a zeroed page on success.
*/
#define __GFP_COLD ((__force gfp_t)___GFP_COLD)
#define __GFP_NOWARN ((__force gfp_t)___GFP_NOWARN)
#define __GFP_COMP ((__force gfp_t)___GFP_COMP)
#define __GFP_ZERO ((__force gfp_t)___GFP_ZERO)

8
include/linux/pagemap.h
View File

@ -234,15 +234,9 @@ static inline struct page *page_cache_alloc(struct address_space *x)
return __page_cache_alloc(mapping_gfp_mask(x));
}
static inline struct page *page_cache_alloc_cold(struct address_space *x)
{
return __page_cache_alloc(mapping_gfp_mask(x)|__GFP_COLD);
}
static inline gfp_t readahead_gfp_mask(struct address_space *x)
{
return mapping_gfp_mask(x) |
__GFP_COLD | __GFP_NORETRY | __GFP_NOWARN;
return mapping_gfp_mask(x) | __GFP_NORETRY | __GFP_NOWARN;
}
typedef int filler_t(void *, struct page *);

2
include/linux/skbuff.h
View File

@ -2672,7 +2672,7 @@ static inline struct page *__dev_alloc_pages(gfp_t gfp_mask,
* 4. __GFP_MEMALLOC is ignored if __GFP_NOMEMALLOC is set due to
* code in gfp_to_alloc_flags that should be enforcing this.
*/
gfp_mask |= __GFP_COLD | __GFP_COMP | __GFP_MEMALLOC;
gfp_mask |= __GFP_COMP | __GFP_MEMALLOC;
return alloc_pages_node(NUMA_NO_NODE, gfp_mask, order);
}

3
include/linux/slab.h
View File

@ -467,9 +467,6 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
* Also it is possible to set different flags by OR'ing
* in one or more of the following additional @flags:
*
* %__GFP_COLD - Request cache-cold pages instead of
* trying to return cache-warm pages.
*
* %__GFP_HIGH - This allocation has high priority and may use emergency pools.
*
* %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail

1
include/trace/events/mmflags.h
View File

@ -32,7 +32,6 @@
{(unsigned long)__GFP_ATOMIC, "__GFP_ATOMIC"}, \
{(unsigned long)__GFP_IO, "__GFP_IO"}, \
{(unsigned long)__GFP_FS, "__GFP_FS"}, \
{(unsigned long)__GFP_COLD, "__GFP_COLD"}, \
{(unsigned long)__GFP_NOWARN, "__GFP_NOWARN"}, \
{(unsigned long)__GFP_RETRY_MAYFAIL, "__GFP_RETRY_MAYFAIL"}, \
{(unsigned long)__GFP_NOFAIL, "__GFP_NOFAIL"}, \

4
kernel/power/snapshot.c
View File

@ -1884,7 +1884,7 @@ static int enough_free_mem(unsigned int nr_pages, unsigned int nr_highmem)
*/
static inline int get_highmem_buffer(int safe_needed)
{
buffer = get_image_page(GFP_ATOMIC | __GFP_COLD, safe_needed);
buffer = get_image_page(GFP_ATOMIC, safe_needed);
return buffer ? 0 : -ENOMEM;
}
@ -1945,7 +1945,7 @@ static int swsusp_alloc(struct memory_bitmap *copy_bm,
while (nr_pages-- > 0) {
struct page *page;
page = alloc_image_page(GFP_ATOMIC | __GFP_COLD);
page = alloc_image_page(GFP_ATOMIC);
if (!page)
goto err_out;
memory_bm_set_bit(copy_bm, page_to_pfn(page));

6
mm/filemap.c
View File

@ -2272,7 +2272,7 @@ no_cached_page:
* Ok, it wasn't cached, so we need to create a new
* page..
*/
page = page_cache_alloc_cold(mapping);
page = page_cache_alloc(mapping);
if (!page) {
error = -ENOMEM;
goto out;
@ -2384,7 +2384,7 @@ static int page_cache_read(struct file *file, pgoff_t offset, gfp_t gfp_mask)
int ret;
do {
page = __page_cache_alloc(gfp_mask|__GFP_COLD);
page = __page_cache_alloc(gfp_mask);
if (!page)
return -ENOMEM;
@ -2788,7 +2788,7 @@ static struct page *do_read_cache_page(struct address_space *mapping,
repeat:
page = find_get_page(mapping, index);
if (!page) {
page = __page_cache_alloc(gfp | __GFP_COLD);
page = __page_cache_alloc(gfp);
if (!page)
return ERR_PTR(-ENOMEM);
err = add_to_page_cache_lru(page, mapping, index, gfp);

20
mm/page_alloc.c
View File

@ -2336,7 +2336,7 @@ retry:
*/
static int rmqueue_bulk(struct zone *zone, unsigned int order,
unsigned long count, struct list_head *list,
int migratetype, bool cold)
int migratetype)
{
int i, alloced = 0;
@ -2358,10 +2358,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
* merge IO requests if the physical pages are ordered
* properly.
*/
if (likely(!cold))
list_add(&page->lru, list);
else
list_add_tail(&page->lru, list);
list_add(&page->lru, list);
list = &page->lru;
alloced++;
if (is_migrate_cma(get_pcppage_migratetype(page)))
@ -2795,7 +2792,7 @@ static inline void zone_statistics(struct zone *preferred_zone, struct zone *z)
/* Remove page from the per-cpu list, caller must protect the list */
static struct page *__rmqueue_pcplist(struct zone *zone, int migratetype,
bool cold, struct per_cpu_pages *pcp,
struct per_cpu_pages *pcp,
struct list_head *list)
{
struct page *page;
@ -2804,16 +2801,12 @@ static struct page *__rmqueue_pcplist(struct zone *zone, int migratetype,
if (list_empty(list)) {
pcp->count += rmqueue_bulk(zone, 0,
pcp->batch, list,
migratetype, cold);
migratetype);
if (unlikely(list_empty(list)))
return NULL;
}
if (cold)
page = list_last_entry(list, struct page, lru);
else
page = list_first_entry(list, struct page, lru);
page = list_first_entry(list, struct page, lru);
list_del(&page->lru);
pcp->count--;
} while (check_new_pcp(page));
@ -2828,14 +2821,13 @@ static struct page *rmqueue_pcplist(struct zone *preferred_zone,
{
struct per_cpu_pages *pcp;
struct list_head *list;
bool cold = ((gfp_flags & __GFP_COLD) != 0);
struct page *page;
unsigned long flags;
local_irq_save(flags);
pcp = &this_cpu_ptr(zone->pageset)->pcp;
list = &pcp->lists[migratetype];
page = __rmqueue_pcplist(zone, migratetype, cold, pcp, list);
page = __rmqueue_pcplist(zone, migratetype, pcp, list);
if (page) {
__count_zid_vm_events(PGALLOC, page_zonenum(page), 1 << order);
zone_statistics(preferred_zone, zone);

2
mm/percpu-vm.c
View File

@ -81,7 +81,7 @@ static void pcpu_free_pages(struct pcpu_chunk *chunk,
static int pcpu_alloc_pages(struct pcpu_chunk *chunk,
struct page **pages, int page_start, int page_end)
{
const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_COLD;
const gfp_t gfp = GFP_KERNEL | __GFP_HIGHMEM;
unsigned int cpu, tcpu;
int i;

4
net/core/skbuff.c
View File

@ -353,7 +353,7 @@ static void *__netdev_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
*/
void *netdev_alloc_frag(unsigned int fragsz)
{
return __netdev_alloc_frag(fragsz, GFP_ATOMIC | __GFP_COLD);
return __netdev_alloc_frag(fragsz, GFP_ATOMIC);
}
EXPORT_SYMBOL(netdev_alloc_frag);
@ -366,7 +366,7 @@ static void *__napi_alloc_frag(unsigned int fragsz, gfp_t gfp_mask)
void *napi_alloc_frag(unsigned int fragsz)
{
return __napi_alloc_frag(fragsz, GFP_ATOMIC | __GFP_COLD);
return __napi_alloc_frag(fragsz, GFP_ATOMIC);
}
EXPORT_SYMBOL(napi_alloc_frag);

1
tools/perf/builtin-kmem.c
View File

@ -641,7 +641,6 @@ static const struct {
{ "__GFP_ATOMIC", "_A" },
{ "__GFP_IO", "I" },
{ "__GFP_FS", "F" },
{ "__GFP_COLD", "CO" },
{ "__GFP_NOWARN", "NWR" },
{ "__GFP_RETRY_MAYFAIL", "R" },
{ "__GFP_NOFAIL", "NF" },