From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with SMTP id 282776B00AE for ; Mon, 16 Feb 2009 12:30:01 -0500 (EST) Received: by fg-out-1718.google.com with SMTP id 19so250215fgg.4 for ; Mon, 16 Feb 2009 09:29:59 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <1234801952.20430.33.camel@localhost> References: <1234272104-10211-1-git-send-email-kirill@shutemov.name> <84144f020902100535i4d626a9fj8cbb305120cf332a@mail.gmail.com> <20090210134651.GA5115@epbyminw8406h.minsk.epam.com> <20090216135643.GA6927@cmpxchg.org> <1234801952.20430.33.camel@localhost> Date: Mon, 16 Feb 2009 19:29:59 +0200 Message-ID: <84144f020902160929k67ce1881p959646a326bb3f40@mail.gmail.com> Subject: Re: [PATCH] Export symbol ksize() From: Pekka Enberg Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Joe Perches Cc: Johannes Weiner , "Kirill A. Shutemov" , Christoph Lameter , Matt Mackall , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-crypto@vger.kernel.org, Herbert Xu , Geert.Uytterhoeven@sonycom.com List-ID: On Mon, 2009-02-16 at 14:56 +0100, Johannes Weiner wrote: >> One problem is that zeroing ksize() >> bytes can have an overhead of nearly twice the actual allocation size. On Mon, Feb 16, 2009 at 6:32 PM, Joe Perches wrote: > A possible good thing is when linux has a > mechanism to use known zeroed memory in > kzalloc or kcalloc, it's already good to go. Hmm, kzfree() is not going to be all that common operation so there won't be that many known zeroed regions and I suspect tracking them will have more overhead than just doing the memset(). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org