Date: Fri, 7 Aug 2015 11:13:48 -0700 From: Andy Lutomirski <luto@...capital.net> To: Nathan Lynch <Nathan_Lynch@...tor.com> Cc: Andy Lutomirski <luto@...nel.org>, Anton Blanchard <anton@...ba.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Chris Metcalf <cmetcalf@...era.com>, Richard Kuo <rkuo@...eaurora.org>, X86 ML <x86@...nel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Isaac Dunham <ibid.ag@...il.com>, Rich Felker <dalias@...c.org>, "musl@...ts.openwall.com" <musl@...ts.openwall.com> Subject: Re: [PATCH] x86/vdso: Emit a GNU hash On Fri, Aug 7, 2015 at 9:10 AM, Nathan Lynch <Nathan_Lynch@...tor.com> wrote: > On 08/06/2015 05:52 PM, Andy Lutomirski wrote: >> [adding lots of cc's] >> >> On Thu, Aug 6, 2015 at 2:45 PM, Andy Lutomirski <luto@...nel.org> wrote: >>> From: Andy Lutomirski <luto@...capital.net> >>> >>> Some dynamic loaders may be slightly faster if a GNU hash is >>> available. Strangely, this seems to have no effect at all on the >>> vdso size. > > FWIW, I see arch/x86/entry/vdso/vdso64.so increase by 168 bytes here, > using GCC 4.9.2, Binutils 2.24 as packaged by Fedora 21. > > I see a similar increase when I make the equivalent change for ARM. > > At least on my configuration, that doesn't push it across a page boundary, so it doesn't really matter. --Andy
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