Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264372AbTEPINX (ORCPT ); Fri, 16 May 2003 04:13:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264373AbTEPINX (ORCPT ); Fri, 16 May 2003 04:13:23 -0400 Received: from mail2.sonytel.be ([195.0.45.172]:55000 "EHLO witte.sonytel.be") by vger.kernel.org with ESMTP id S264372AbTEPINW (ORCPT ); Fri, 16 May 2003 04:13:22 -0400 Date: Fri, 16 May 2003 10:24:22 +0200 (MEST) From: Geert Uytterhoeven To: James Simmons cc: Petr Vandrovec , Linux Fbdev development list , Linux Kernel Mailing List Subject: Re: [Linux-fbdev-devel] Re: [BK FBDEV] String drawing optimizations. In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1573 Lines: 38 On Thu, 15 May 2003, James Simmons wrote: > > What about getting rid of one-char putc, implementing it in terms of > > putcs? I'm doing it in matroxfb patches, and nobody complained yet, and > > with current length of {fbcon,accel}_putc{s,} I was not able to find > > measurable speed difference between putc and putc through putcs variants. > > Hm. I compressed all the image drawing functions into accel_putcs which is > used in many places. I then placed accel_putc() into fbcon_putc(). I could > have accel_putcs() called in fbcon_putc(). The advantage is smaller > amount of code. The offset is a big more overhead plus a function call. > What do people think here? putc() is almost never called, IIRC. We did our best to combine as much data as possible and call putcs(). A quick grep showed ->con_putc() is called only in drivers/char/vt.c for: - Complementing the pointer position (for gpm) - Inserting/deleting single characters - Softcursor I guess the small overhead won't have much influence here. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds - 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/