Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752204Ab0FHCRG (ORCPT ); Mon, 7 Jun 2010 22:17:06 -0400 Received: from lennier.cc.vt.edu ([198.82.162.213]:38685 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750897Ab0FHCRE (ORCPT ); Mon, 7 Jun 2010 22:17:04 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: Linus Walleij Cc: Peter Zijlstra , Brian Swetland , Christoph Hellwig , James Bottomley , Thomas Gleixner , Alan Cox , Florian Mickler , Vitaly Wool , Arve Hj?nnev?g , Arjan van de Ven , tytso@mit.edu, "H. Peter Anvin" , LKML , Neil Brown , Linux PM , Ingo Molnar , Linux OMAP Mailing List , Linus Torvalds , Felipe Balbi , hackbod@android.com Subject: Re: [linux-pm] suspend blockers & Android integration In-Reply-To: Your message of "Tue, 08 Jun 2010 01:17:13 +0200." From: Valdis.Kletnieks@vt.edu References: <1275834706.7227.545.camel@mulgrave.site> <1275844114.7227.552.camel@mulgrave.site> <20100606190525.GA20517@infradead.org> <20100606192405.GA7559@infradead.org> <1275916830.1645.566.camel@laptop> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1275963300_4518P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Mon, 07 Jun 2010 22:15:00 -0400 Message-ID: <9277.1275963300@localhost> X-Mirapoint-Received-SPF: 128.173.34.98 localhost Valdis.Kletnieks@vt.edu 2 pass X-Mirapoint-IP-Reputation: reputation=neutral-1, source=Fixed, refid=n/a, actions=MAILHURDLE SPF TAG X-Junkmail-Info: (45) HELO_LOCALHOST X-Junkmail-Status: score=45/50, host=vivi.cc.vt.edu X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A020201.4C0DA7A6.012F,ss=1,fgs=0, ip=0.0.0.0, so=2009-09-22 00:05:22, dmn=2009-09-10 00:05:08, mode=multiengine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1407 Lines: 40 --==_Exmh_1275963300_4518P Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable On Tue, 08 Jun 2010 01:17:13 +0200, Linus Walleij said: > So I would really like to know from the Android people why the > binder is in the kernel, after all. Could it *theoretically* be in > userspace, on top of some unix domain sockets, running as a > real-time scheduled daemon or whatever, still yielding the same > performance? Or is there some discovered limitation with current > interfaces, that everybody ought to know? Not an Android person, but... How expensive is a userspace->kernel transition on Android-class hardware= ? There's certainly something to be said for short-circuiting the path source_process -> kernel -> broker_process -> kernel -> dest_process down to the shorter source->kernel->dest --==_Exmh_1275963300_4518P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFMDaekcC3lWbTT17ARAt6/AKDbDjjyziWGe4de18hkFdAqzkypvwCghfkj Ynyp1vcd2/PGbvCNUFucXqo= =gM5X -----END PGP SIGNATURE----- --==_Exmh_1275963300_4518P-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/