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[2620:137:e000::1:20]) by mx.google.com with ESMTP id sc2-20020a1709078a0200b00947ae261df0si1574540ejc.326.2023.04.05.09.57.49; Wed, 05 Apr 2023 09:58:15 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=GylYef7p; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232271AbjDEQzZ (ORCPT + 99 others); Wed, 5 Apr 2023 12:55:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60376 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230144AbjDEQzU (ORCPT ); Wed, 5 Apr 2023 12:55:20 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BB49B4ED0 for ; Wed, 5 Apr 2023 09:53:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1680713638; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5HFcSli7GWFgeyoEx21ojBPq2vhhM7tieZtPm930p+c=; b=GylYef7p+jpVN9uzCLTEglx/uEpamy8qDTyXoyTn82CbHHJmScl6mKpw1FZoWdzJjwuYXQ 6lMXBL35vcRay3oPl3G1MG9H89jj5icKXlM7licYOZw+QwGwDLqh7EB7g7tlecgVTdyB7f NHAE6ZUKwEAODZLDZzCI2OXJglYAaFw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-163-JZMa1yBiN6mNkIPxSZoyZQ-1; Wed, 05 Apr 2023 12:53:57 -0400 X-MC-Unique: JZMa1yBiN6mNkIPxSZoyZQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.rdu2.redhat.com [10.11.54.8]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 53FD1185A794; Wed, 5 Apr 2023 16:53:56 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4A7E8C1602A; Wed, 5 Apr 2023 16:53:54 +0000 (UTC) From: David Howells To: netdev@vger.kernel.org Cc: David Howells , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Willem de Bruijn , Matthew Wilcox , Al Viro , Christoph Hellwig , Jens Axboe , Jeff Layton , Christian Brauner , Chuck Lever III , Linus Torvalds , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH net-next v4 04/20] mm: Make the page_frag_cache allocator use multipage folios Date: Wed, 5 Apr 2023 17:53:23 +0100 Message-Id: <20230405165339.3468808-5-dhowells@redhat.com> In-Reply-To: <20230405165339.3468808-1-dhowells@redhat.com> References: <20230405165339.3468808-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.8 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1762356253306601771?= X-GMAIL-MSGID: =?utf-8?q?1762356253306601771?= Change the page_frag_cache allocator to use multipage folios rather than groups of pages. This reduces page_frag_free to just a folio_put() or put_page(). Signed-off-by: David Howells cc: "David S. Miller" cc: Eric Dumazet cc: Jakub Kicinski cc: Paolo Abeni cc: Jens Axboe cc: Matthew Wilcox cc: netdev@vger.kernel.org --- drivers/net/ethernet/mediatek/mtk_wed_wo.c | 15 +-- drivers/nvme/host/tcp.c | 7 +- drivers/nvme/target/tcp.c | 5 +- include/linux/gfp.h | 1 + include/linux/mm_types.h | 13 +-- mm/page_frag_alloc.c | 101 +++++++++++---------- 6 files changed, 63 insertions(+), 79 deletions(-) diff --git a/drivers/net/ethernet/mediatek/mtk_wed_wo.c b/drivers/net/ethernet/mediatek/mtk_wed_wo.c index 69fba29055e9..6ce532217777 100644 --- a/drivers/net/ethernet/mediatek/mtk_wed_wo.c +++ b/drivers/net/ethernet/mediatek/mtk_wed_wo.c @@ -286,7 +286,6 @@ mtk_wed_wo_queue_free(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) static void mtk_wed_wo_queue_tx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) { - struct page *page; int i; for (i = 0; i < q->n_desc; i++) { @@ -298,12 +297,7 @@ mtk_wed_wo_queue_tx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) entry->buf = NULL; } - if (!q->cache.va) - return; - - page = virt_to_page(q->cache.va); - __page_frag_cache_drain(page, q->cache.pagecnt_bias); - memset(&q->cache, 0, sizeof(q->cache)); + page_frag_cache_clear(&q->cache); } static void @@ -320,12 +314,7 @@ mtk_wed_wo_queue_rx_clean(struct mtk_wed_wo *wo, struct mtk_wed_wo_queue *q) skb_free_frag(buf); } - if (!q->cache.va) - return; - - page = virt_to_page(q->cache.va); - __page_frag_cache_drain(page, q->cache.pagecnt_bias); - memset(&q->cache, 0, sizeof(q->cache)); + page_frag_cache_clear(&q->cache); } static void diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 42c0598c31f2..76f12ac714b0 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -1323,12 +1323,7 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid) if (queue->hdr_digest || queue->data_digest) nvme_tcp_free_crypto(queue); - if (queue->pf_cache.va) { - page = virt_to_head_page(queue->pf_cache.va); - __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias); - queue->pf_cache.va = NULL; - } - + page_frag_cache_clear(&queue->pf_cache); noreclaim_flag = memalloc_noreclaim_save(); sock_release(queue->sock); memalloc_noreclaim_restore(noreclaim_flag); diff --git a/drivers/nvme/target/tcp.c b/drivers/nvme/target/tcp.c index 66e8f9fd0ca7..ae871c31cf00 100644 --- a/drivers/nvme/target/tcp.c +++ b/drivers/nvme/target/tcp.c @@ -1438,7 +1438,6 @@ static void nvmet_tcp_free_cmd_data_in_buffers(struct nvmet_tcp_queue *queue) static void nvmet_tcp_release_queue_work(struct work_struct *w) { - struct page *page; struct nvmet_tcp_queue *queue = container_of(w, struct nvmet_tcp_queue, release_work); @@ -1460,9 +1459,7 @@ static void nvmet_tcp_release_queue_work(struct work_struct *w) if (queue->hdr_digest || queue->data_digest) nvmet_tcp_free_crypto(queue); ida_free(&nvmet_tcp_queue_ida, queue->idx); - - page = virt_to_head_page(queue->pf_cache.va); - __page_frag_cache_drain(page, queue->pf_cache.pagecnt_bias); + page_frag_cache_clear(&queue->pf_cache); kfree(queue); } diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 65a78773dcca..5e15384798eb 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -313,6 +313,7 @@ static inline void *page_frag_alloc(struct page_frag_cache *nc, { return page_frag_alloc_align(nc, fragsz, gfp_mask, ~0u); } +void page_frag_cache_clear(struct page_frag_cache *nc); extern void page_frag_free(void *addr); diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 0722859c3647..49a70b3f44a9 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -420,18 +420,13 @@ static inline void *folio_get_private(struct folio *folio) } struct page_frag_cache { - void * va; -#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) - __u16 offset; - __u16 size; -#else - __u32 offset; -#endif + struct folio *folio; + unsigned int offset; /* we maintain a pagecount bias, so that we dont dirty cache line * containing page->_refcount every time we allocate a fragment. */ - unsigned int pagecnt_bias; - bool pfmemalloc; + unsigned int pagecnt_bias; + bool pfmemalloc; }; typedef unsigned long vm_flags_t; diff --git a/mm/page_frag_alloc.c b/mm/page_frag_alloc.c index bee95824ef8f..9b138cb0e3a4 100644 --- a/mm/page_frag_alloc.c +++ b/mm/page_frag_alloc.c @@ -16,88 +16,95 @@ #include #include -static struct page *__page_frag_cache_refill(struct page_frag_cache *nc, - gfp_t gfp_mask) +/* + * Allocate a new folio for the frag cache. + */ +static struct folio *page_frag_cache_refill(struct page_frag_cache *nc, + gfp_t gfp_mask) { - struct page *page = NULL; + struct folio *folio = NULL; gfp_t gfp = gfp_mask; #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) - gfp_mask |= __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | - __GFP_NOMEMALLOC; - page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, - PAGE_FRAG_CACHE_MAX_ORDER); - nc->size = page ? PAGE_FRAG_CACHE_MAX_SIZE : PAGE_SIZE; + gfp_mask |= __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC; + folio = folio_alloc(gfp_mask, PAGE_FRAG_CACHE_MAX_ORDER); #endif - if (unlikely(!page)) - page = alloc_pages_node(NUMA_NO_NODE, gfp, 0); - - nc->va = page ? page_address(page) : NULL; + if (unlikely(!folio)) + folio = folio_alloc(gfp, 0); - return page; + if (folio) + nc->folio = folio; + return folio; } void __page_frag_cache_drain(struct page *page, unsigned int count) { - VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); + struct folio *folio = page_folio(page); - if (page_ref_sub_and_test(page, count - 1)) - __free_pages(page, compound_order(page)); + VM_BUG_ON_FOLIO(folio_ref_count(folio) == 0, folio); + + folio_put_refs(folio, count); } EXPORT_SYMBOL(__page_frag_cache_drain); +void page_frag_cache_clear(struct page_frag_cache *nc) +{ + struct folio *folio = nc->folio; + + if (folio) { + VM_BUG_ON_FOLIO(folio_ref_count(folio) == 0, folio); + folio_put_refs(folio, nc->pagecnt_bias); + nc->folio = NULL; + } + +} +EXPORT_SYMBOL(page_frag_cache_clear); + void *page_frag_alloc_align(struct page_frag_cache *nc, unsigned int fragsz, gfp_t gfp_mask, unsigned int align_mask) { - unsigned int size = PAGE_SIZE; - struct page *page; - int offset; + struct folio *folio = nc->folio; + size_t offset; - if (unlikely(!nc->va)) { + if (unlikely(!folio)) { refill: - page = __page_frag_cache_refill(nc, gfp_mask); - if (!page) + folio = page_frag_cache_refill(nc, gfp_mask); + if (!folio) return NULL; -#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) - /* if size can vary use size else just use PAGE_SIZE */ - size = nc->size; -#endif /* Even if we own the page, we do not use atomic_set(). * This would break get_page_unless_zero() users. */ - page_ref_add(page, PAGE_FRAG_CACHE_MAX_SIZE); + folio_ref_add(folio, PAGE_FRAG_CACHE_MAX_SIZE); /* reset page count bias and offset to start of new frag */ - nc->pfmemalloc = page_is_pfmemalloc(page); + nc->pfmemalloc = folio_is_pfmemalloc(folio); nc->pagecnt_bias = PAGE_FRAG_CACHE_MAX_SIZE + 1; - nc->offset = size; + nc->offset = folio_size(folio); } - offset = nc->offset - fragsz; - if (unlikely(offset < 0)) { - page = virt_to_page(nc->va); - - if (page_ref_count(page) != nc->pagecnt_bias) + offset = nc->offset; + if (unlikely(fragsz > offset)) { + /* Reuse the folio if everyone we gave it to has finished with it. */ + if (!folio_ref_sub_and_test(folio, nc->pagecnt_bias)) { + nc->folio = NULL; goto refill; + } + if (unlikely(nc->pfmemalloc)) { - page_ref_sub(page, nc->pagecnt_bias - 1); - __free_pages(page, compound_order(page)); + __folio_put(folio); + nc->folio = NULL; goto refill; } -#if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) - /* if size can vary use size else just use PAGE_SIZE */ - size = nc->size; -#endif /* OK, page count is 0, we can safely set it */ - set_page_count(page, PAGE_FRAG_CACHE_MAX_SIZE + 1); + folio_set_count(folio, PAGE_FRAG_CACHE_MAX_SIZE + 1); /* reset page count bias and offset to start of new frag */ nc->pagecnt_bias = PAGE_FRAG_CACHE_MAX_SIZE + 1; - offset = size - fragsz; - if (unlikely(offset < 0)) { + offset = folio_size(folio); + if (unlikely(fragsz > offset)) { /* * The caller is trying to allocate a fragment * with fragsz > PAGE_SIZE but the cache isn't big @@ -107,15 +114,17 @@ void *page_frag_alloc_align(struct page_frag_cache *nc, * it could make memory pressure worse * so we simply return NULL here. */ + nc->offset = offset; return NULL; } } nc->pagecnt_bias--; + offset -= fragsz; offset &= align_mask; nc->offset = offset; - return nc->va + offset; + return folio_address(folio) + offset; } EXPORT_SYMBOL(page_frag_alloc_align); @@ -124,8 +133,6 @@ EXPORT_SYMBOL(page_frag_alloc_align); */ void page_frag_free(void *addr) { - struct page *page = virt_to_head_page(addr); - - __free_pages(page, compound_order(page)); + folio_put(virt_to_folio(addr)); } EXPORT_SYMBOL(page_frag_free);