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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id m16si29339348pls.150.2019.04.10.06.15.07 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 10 Apr 2019 06:15:07 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=g1+ntTH2; spf=pass (google.com: best guess record for domain of willy@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=willy@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=MEPaCQfo2hefz4J3PUM1A06gWxgInUirpFQlLPvFhfs=; b=g1+ntTH2KjkaZY6X8gH2UpJ9H 90kq4TsfAcfmfo8Q578x7gph3bIN0aFrH3DkHRz3yHtDgsn3yCt2r67Bd1qISmu584+ahidyQqbKU ICvIKeqVwwxGxh17ZV2C6/QLQB4+o5+1BalHbNqJezK4jy1KOKEjDiOj4ampYCoHD+uUe+1maXv3s H7cho5UOf/9oJAZnshxDSwxeR70o0hkUZW5aMAegPD309BLjudmq9L8OD0nV4jZ7E7Suh6Fn5aV9y 9rYy3WEOkzvB9FnIUgwtXLeBraNkBI/b68XXVANLh5LnutlvhpR6skhrWakwT5ElpNu1GmW27l5Xf HAEr9iHKQ==; Received: from willy by bombadil.infradead.org with local (Exim 4.90_1 #2 (Red Hat Linux)) id 1hED40-0006NA-Au; Wed, 10 Apr 2019 13:14:52 +0000 Date: Wed, 10 Apr 2019 06:14:52 -0700 From: Matthew Wilcox To: Jared Hu Cc: "akpm@linux-foundation.org" , "vbabka@suse.cz" , "iamjoonsoo.kim@lge.com" , "labbott@redhat.com" , "huyue2@yulong.com" , "m.szyprowski@samsung.com" , "rppt@linux.ibm.com" , "andreyknvl@google.com" , "linux-mm@kvack.org" Subject: Re: question for cma alloc fail issue Message-ID: <20190410131452.GA22763@bombadil.infradead.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.2 (2017-12-15) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Apr 10, 2019 at 10:48:26AM +0000, Jared Hu wrote: > 2. The pages that are free in cma->bitmap seem not free in Buddy system? > PageBuddy() test can also return false even if the page is in the free list in cma bitmap That's correct. They've been allocated by the CMA allocator, and are no longer available for allocation by the page allocator.