From 453f85d43fa9ee243f0fc3ac4e1be45615301e3f Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Wed, 15 Nov 2017 17:38:03 -0800 Subject: 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 Acked-by: Vlastimil Babka Cc: Andi Kleen Cc: Dave Chinner Cc: Dave Hansen Cc: Jan Kara Cc: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/net/ethernet/amazon/ena/ena_netdev.c | 2 +- drivers/net/ethernet/amd/xgbe/xgbe-desc.c | 2 +- drivers/net/ethernet/aquantia/atlantic/aq_ring.c | 3 +-- drivers/net/ethernet/cavium/liquidio/octeon_network.h | 2 +- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 5 ++--- drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 4 ++-- drivers/net/ethernet/qlogic/qlge/qlge_main.c | 3 +-- drivers/net/ethernet/sfc/falcon/rx.c | 2 +- drivers/net/ethernet/sfc/rx.c | 2 +- drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c | 2 +- drivers/net/ethernet/ti/netcp_core.c | 2 +- drivers/net/virtio_net.c | 1 - 12 files changed, 13 insertions(+), 17 deletions(-) (limited to 'drivers/net') diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c index c6bd5e24005d..fbbbd8b3eb45 100644 --- a/drivers/net/ethernet/amazon/ena/ena_netdev.c +++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c @@ -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", diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-desc.c b/drivers/net/ethernet/amd/xgbe/xgbe-desc.c index 45d92304068e..cc1e4f820e64 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-desc.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-desc.c @@ -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) diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c index 0654e0c76bc2..519ca6534b85 100644 --- a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c +++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c @@ -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; diff --git a/drivers/net/ethernet/cavium/liquidio/octeon_network.h b/drivers/net/ethernet/cavium/liquidio/octeon_network.h index 9e36319cead6..57853eead4b5 100644 --- a/drivers/net/ethernet/cavium/liquidio/octeon_network.h +++ b/drivers/net/ethernet/cavium/liquidio/octeon_network.h @@ -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; diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c index b97a55c827eb..ffead38cf5da 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -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)); diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c index e118b5f23996..ffb12dc13a5a 100644 --- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c +++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c @@ -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) { diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_main.c b/drivers/net/ethernet/qlogic/qlge/qlge_main.c index 29fea74bff2e..7b97a9969046 100644 --- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c +++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c @@ -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, diff --git a/drivers/net/ethernet/sfc/falcon/rx.c b/drivers/net/ethernet/sfc/falcon/rx.c index 6a8406dc0c2b..91097aea6c41 100644 --- a/drivers/net/ethernet/sfc/falcon/rx.c +++ b/drivers/net/ethernet/sfc/falcon/rx.c @@ -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)) diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c index 42443f434569..0004c50d3c83 100644 --- a/drivers/net/ethernet/sfc/rx.c +++ b/drivers/net/ethernet/sfc/rx.c @@ -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)) diff --git a/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c b/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c index e9672b1f9968..031cf9c3435a 100644 --- a/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c +++ b/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c @@ -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) diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c index 437d36289786..50d2b76771b5 100644 --- a/drivers/net/ethernet/ti/netcp_core.c +++ b/drivers/net/ethernet/ti/netcp_core.c @@ -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; diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 511f8339fa96..5eec09d63fc0 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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); -- cgit v1.2.3