From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Wilcox Date: Thu, 14 Oct 2004 17:36:37 +0000 Subject: Re: [PATCH] General purpose zeroed page slab Message-Id: <20041014173637.GQ16153@parcelfarce.linux.theplanet.co.uk> List-Id: References: <416EB7AD.4040302@didntduck.org> In-Reply-To: <416EB7AD.4040302@didntduck.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Brian Gerst Cc: "Martin K. Petersen" , linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, akpm@osdl.org, tony.luck@intel.com On Thu, Oct 14, 2004 at 01:30:21PM -0400, Brian Gerst wrote: > This doesn't work as you expect it does. The constructor is only called > when a new slab is created, for each new object on the slab. It is > _not_ run again when an object is freed. So if a page is freed then > immediately reallocated it will contain garbage. The user is responsible for zeroing the page before handing it back to the slab allocator. -- "Next the statesmen will invent cheap lies, putting the blame upon the nation that is attacked, and every man will be glad of those conscience-soothing falsities, and will diligently study them, and refuse to examine any refutations of them; and thus he will by and by convince himself that the war is just, and will thank God for the better sleep he enjoys after this process of grotesque self-deception." -- Mark Twain