From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6E378C61DB3 for ; Thu, 12 Jan 2023 16:01:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233181AbjALQBW (ORCPT ); Thu, 12 Jan 2023 11:01:22 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42538 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233504AbjALQAu (ORCPT ); Thu, 12 Jan 2023 11:00:50 -0500 Received: from mail-qt1-x82d.google.com (mail-qt1-x82d.google.com [IPv6:2607:f8b0:4864:20::82d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34C546436 for ; Thu, 12 Jan 2023 07:53:44 -0800 (PST) Received: by mail-qt1-x82d.google.com with SMTP id v14so16767851qtq.3 for ; Thu, 12 Jan 2023 07:53:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TBH19B7tt8c2ZqgTL5MGs4kQ+EgYdVrIXT4FgqCf58E=; b=V5AonCl6GtoPHEQDYaUYetOY7qBor5eB4wJnYjHi6v81IJ6LFl63Vb7qTQ6fZ62GmJ FZ3VHrJc1gdN1TOHjP2hoB35KssqBdVaaZbEQZ/E5zivkI0c5eo7XBU1gZCICr7Fpmmx tK8mbPvFPAdW5NE9w07N1Eta2988UZDI9ppynyPtdFQ5OYtkpv0D4+CkEJpBYNYN+qyQ uuqqCAyOCmPlXT/hg59VPHxvJMezaeIia6wBeOewTU0JIGj73v/uGM99APwnJyPb1MAa 6tlQS2nILNzaj0VNoUnSKxnsveyfjiyJpOyMNF4QnV3ia2uczbf/7pWYoLPwNbm+KQcS i0Fg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TBH19B7tt8c2ZqgTL5MGs4kQ+EgYdVrIXT4FgqCf58E=; b=ubCJJVfszDabdCVoX9hC/8S9QICGAzxCX6irL1PhQzkQgAx/HlRyPkgKXEzDBi8Cae z2sbSEZN/V8iSObfcV9fPbMarjsghpvG8436yh63sYAfhA2RZp0FaLFFmYRWs6kdsKBr jGrAC8zSh+2SSETdxtUOQPIMuBxYcOyPvd88q/JGJC9cAKWwIF1B3fsTd7UpgTcqHdV6 hpJyWDhyRT9Toe5oOr4LmZ+9bakCSWKSI3c46Rp63FypRwjMM3meF/3ymzaHENkgcmZb b78d+JuKr8DJeJusuttLlknLRZfR4A3vnnzuTPmLQt9YUq1YU//IRjTubfZ/YIyVb6aW OEKQ== X-Gm-Message-State: AFqh2kq+Py74Ju+76aUlO818qYjVzAhF5nuYsOt76eOkWmDCRhVj7pOv QXgKFJUrrfVkZe+HSIGsfKU= X-Google-Smtp-Source: AMrXdXunMQbXCe3PjTlqR622vY/D62Blbxfq9VYi3TCPRza8jAekLqfz3F3c2jSj1Xlfyg52SWyWbw== X-Received: by 2002:ac8:7957:0:b0:3ad:903d:3ed4 with SMTP id r23-20020ac87957000000b003ad903d3ed4mr19548488qtt.59.1673538823178; Thu, 12 Jan 2023 07:53:43 -0800 (PST) Received: from vultr.guest ([173.199.122.241]) by smtp.gmail.com with ESMTPSA id l17-20020ac848d1000000b003ab43dabfb1sm9280836qtr.55.2023.01.12.07.53.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Jan 2023 07:53:42 -0800 (PST) From: Yafang Shao To: 42.hyeyoo@gmail.com, vbabka@suse.cz, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, tj@kernel.org, dennis@kernel.org, cl@linux.com, akpm@linux-foundation.org, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, roman.gushchin@linux.dev Cc: linux-mm@kvack.org, bpf@vger.kernel.org, Yafang Shao Subject: [RFC PATCH bpf-next v2 07/11] bpf: introduce new helpers bpf_ringbuf_pages_{alloc,free} Date: Thu, 12 Jan 2023 15:53:22 +0000 Message-Id: <20230112155326.26902-8-laoar.shao@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230112155326.26902-1-laoar.shao@gmail.com> References: <20230112155326.26902-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Allocate pages related memory into the new helper bpf_ringbuf_pages_alloc(), then it can be handled as a single unit. Suggested-by: Andrii Nakryiko Signed-off-by: Yafang Shao Acked-by: Andrii Nakryiko --- kernel/bpf/ringbuf.c | 71 ++++++++++++++++++++++++++++++++++------------------ 1 file changed, 47 insertions(+), 24 deletions(-) diff --git a/kernel/bpf/ringbuf.c b/kernel/bpf/ringbuf.c index 80f4b4d..3264bf5 100644 --- a/kernel/bpf/ringbuf.c +++ b/kernel/bpf/ringbuf.c @@ -92,6 +92,48 @@ struct bpf_ringbuf_hdr { u32 pg_off; }; +static void bpf_ringbuf_pages_free(struct page **pages, int nr_pages) +{ + int i; + + for (i = 0; i < nr_pages; i++) + __free_page(pages[i]); + bpf_map_area_free(pages); +} + +static struct page **bpf_ringbuf_pages_alloc(int nr_meta_pages, + int nr_data_pages, int numa_node, + const gfp_t flags) +{ + int nr_pages = nr_meta_pages + nr_data_pages; + struct page **pages, *page; + int array_size; + int i; + + array_size = (nr_meta_pages + 2 * nr_data_pages) * sizeof(*pages); + pages = bpf_map_area_alloc(array_size, numa_node); + if (!pages) + goto err; + + for (i = 0; i < nr_pages; i++) { + page = alloc_pages_node(numa_node, flags, 0); + if (!page) { + nr_pages = i; + goto err_free_pages; + } + pages[i] = page; + if (i >= nr_meta_pages) + pages[nr_data_pages + i] = page; + } + + return pages; + +err_free_pages: + bpf_ringbuf_pages_free(pages, nr_pages); +err: + return NULL; +} + static struct bpf_ringbuf *bpf_ringbuf_area_alloc(size_t data_sz, int numa_node) { const gfp_t flags = GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL | @@ -99,10 +141,8 @@ static struct bpf_ringbuf *bpf_ringbuf_area_alloc(size_t data_sz, int numa_node) int nr_meta_pages = RINGBUF_PGOFF + RINGBUF_POS_PAGES; int nr_data_pages = data_sz >> PAGE_SHIFT; int nr_pages = nr_meta_pages + nr_data_pages; - struct page **pages, *page; struct bpf_ringbuf *rb; - size_t array_size; - int i; + struct page **pages; /* Each data page is mapped twice to allow "virtual" * continuous read of samples wrapping around the end of ring @@ -121,22 +161,11 @@ static struct bpf_ringbuf *bpf_ringbuf_area_alloc(size_t data_sz, int numa_node) * when mmap()'ed in user-space, simplifying both kernel and * user-space implementations significantly. */ - array_size = (nr_meta_pages + 2 * nr_data_pages) * sizeof(*pages); - pages = bpf_map_area_alloc(array_size, numa_node); + pages = bpf_ringbuf_pages_alloc(nr_meta_pages, nr_data_pages, + numa_node, flags); if (!pages) return NULL; - for (i = 0; i < nr_pages; i++) { - page = alloc_pages_node(numa_node, flags, 0); - if (!page) { - nr_pages = i; - goto err_free_pages; - } - pages[i] = page; - if (i >= nr_meta_pages) - pages[nr_data_pages + i] = page; - } - rb = vmap(pages, nr_meta_pages + 2 * nr_data_pages, VM_MAP | VM_USERMAP, PAGE_KERNEL); if (rb) { @@ -146,10 +175,6 @@ static struct bpf_ringbuf *bpf_ringbuf_area_alloc(size_t data_sz, int numa_node) return rb; } -err_free_pages: - for (i = 0; i < nr_pages; i++) - __free_page(pages[i]); - bpf_map_area_free(pages); return NULL; } @@ -219,12 +244,10 @@ static void bpf_ringbuf_free(struct bpf_ringbuf *rb) * to unmap rb itself with vunmap() below */ struct page **pages = rb->pages; - int i, nr_pages = rb->nr_pages; + int nr_pages = rb->nr_pages; vunmap(rb); - for (i = 0; i < nr_pages; i++) - __free_page(pages[i]); - bpf_map_area_free(pages); + bpf_ringbuf_pages_free(pages, nr_pages); } static void ringbuf_map_free(struct bpf_map *map) -- 1.8.3.1