From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [203.10.76.45]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client CN "mx.ozlabs.org", Issuer "CA Cert Signing Authority" (verified OK)) by bilbo.ozlabs.org (Postfix) with ESMTPS id F028EB7086 for ; Tue, 14 Jul 2009 17:07:20 +1000 (EST) Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 526D0DDDB6 for ; Tue, 14 Jul 2009 17:07:19 +1000 (EST) Subject: Re: [patch 1/3] powerpc: Move 64bit VDSO to improve context switch performance From: Benjamin Herrenschmidt To: Anton Blanchard In-Reply-To: <20090714065425.301516312@samba.org> References: <20090714065350.659537380@samba.org> <20090714065425.301516312@samba.org> Content-Type: text/plain Date: Tue, 14 Jul 2009 17:07:13 +1000 Message-Id: <1247555233.29462.86.camel@pasglop> Mime-Version: 1.0 Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Tue, 2009-07-14 at 16:53 +1000, Anton Blanchard wrote: > plain text document attachment (move_vdso_v2) > On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO > is position independent we can remove the hint and let get_unmapped_area pick > an area. This will mean the vdso will be near other mmaps and will share > an SLB entry: Don't we lose randomization ? Or do we randomize the whole mem map nowadays ? Cheers, Ben.