From patchwork Wed May 15 13:09:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunsheng Lin X-Patchwork-Id: 13665245 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 292DF12AAEB; Wed, 15 May 2024 13:12:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.188 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715778759; cv=none; b=KNGlnW8vdK045fnOn7buZl0z6zOdMFGMm1gLxltSLRhcgId5AaIjMK/Y8Yk9ebG+XK0vasMlo63MYBfexWxZF96dSWtnUMgwgxt0SLxSpspdslPFwe5W2+5xsBTJUUBVnPTPhfpqVCKj2Qw81M3U7ZHeEeoMIlN26jVZFQbYWcg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715778759; c=relaxed/simple; bh=qEXuc3p5hwOyD6brYLf7OG5VYwINvfEp8zy3rtODKgI=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=tgBaYG3CfyU5eMJZoPg9rgp4D4bMM0jAxJq0FWBC4ldyfE/eQk9CdESAf9jOU+mko3ie+HSJX0G/REIgrakrUPlbhX9myDcAnjcaEQes7lXn8DAOmjibuIixYnfVZ8eltbaI9AyuvHgKVsvHFFVBhlEBoJ4cW+q7xMVoxkj0wXs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.162.254]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4VfYSf3JMSzVm4p; Wed, 15 May 2024 21:08:34 +0800 (CST) Received: from dggpemm500005.china.huawei.com (unknown [7.185.36.74]) by mail.maildlp.com (Postfix) with ESMTPS id EEB3218007D; Wed, 15 May 2024 21:12:35 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by dggpemm500005.china.huawei.com (7.185.36.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Wed, 15 May 2024 21:12:35 +0800 From: Yunsheng Lin To: , , CC: , , Yunsheng Lin , Alexander Duyck , Andrew Morton , Subject: [RFC v4 03/13] mm: page_frag: use free_unref_page() to free page fragment Date: Wed, 15 May 2024 21:09:22 +0800 Message-ID: <20240515130932.18842-4-linyunsheng@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20240515130932.18842-1-linyunsheng@huawei.com> References: <20240515130932.18842-1-linyunsheng@huawei.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500005.china.huawei.com (7.185.36.74) X-Patchwork-State: RFC free_the_page() used by page_frag call free_unref_page() or __free_pages_ok() depending on pcp_allowed_order(), as the max order of page allocated for page_frag is 3, the checking in pcp_allowed_order() is unnecessary. So call free_unref_page() directly to free a page_frag page to aovid the unnecessary checking. As the free_the_page() is a static function in page_alloc.c, using the new one also allow moving page_frag related code to a new file in the next patch. CC: Alexander Duyck Signed-off-by: Yunsheng Lin --- mm/page_alloc.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 14d39f34d336..7adb29f8f364 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -4693,6 +4693,9 @@ static struct page *__page_frag_cache_refill(struct page_frag_cache *nc, gfp_t gfp = gfp_mask; #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) + /* Ensure free_unref_page() can be used to free the page fragment */ + BUILD_BUG_ON(PAGE_FRAG_CACHE_MAX_ORDER > PAGE_ALLOC_COSTLY_ORDER); + gfp_mask = (gfp_mask & ~__GFP_DIRECT_RECLAIM) | __GFP_COMP | __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC; page = alloc_pages_node(NUMA_NO_NODE, gfp_mask, @@ -4722,7 +4725,7 @@ void __page_frag_cache_drain(struct page *page, unsigned int count) VM_BUG_ON_PAGE(page_ref_count(page) == 0, page); if (page_ref_sub_and_test(page, count)) - free_the_page(page, compound_order(page)); + free_unref_page(page, compound_order(page)); } EXPORT_SYMBOL(__page_frag_cache_drain); @@ -4763,7 +4766,7 @@ void *__page_frag_alloc_align(struct page_frag_cache *nc, goto refill; if (unlikely(nc->pfmemalloc)) { - free_the_page(page, compound_order(page)); + free_unref_page(page, compound_order(page)); goto refill; } @@ -4807,7 +4810,7 @@ void page_frag_free(void *addr) struct page *page = virt_to_head_page(addr); if (unlikely(put_page_testzero(page))) - free_the_page(page, compound_order(page)); + free_unref_page(page, compound_order(page)); } EXPORT_SYMBOL(page_frag_free);