Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269283AbUINLbK (ORCPT ); Tue, 14 Sep 2004 07:31:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269282AbUINL3j (ORCPT ); Tue, 14 Sep 2004 07:29:39 -0400 Received: from mx2.elte.hu ([157.181.151.9]:40321 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S269292AbUINL0L (ORCPT ); Tue, 14 Sep 2004 07:26:11 -0400 Date: Tue, 14 Sep 2004 13:08:38 +0200 From: Ingo Molnar To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Alexander Viro Subject: [patch] sched, pty: fix scheduling latencies in pty.c Message-ID: <20040914110838.GA32466@elte.hu> References: <20040914095110.GA24094@elte.hu> <20040914095731.GA24622@elte.hu> <20040914100652.GB24622@elte.hu> <20040914101904.GD24622@elte.hu> <20040914102517.GE24622@elte.hu> <20040914104449.GA30790@elte.hu> <20040914105048.GA31238@elte.hu> <20040914105904.GB31370@elte.hu> <20040914110237.GC31370@elte.hu> <20040914110611.GA32077@elte.hu> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="PEIAKu/WMn1b1Hv9" Content-Disposition: inline In-Reply-To: <20040914110611.GA32077@elte.hu> User-Agent: Mutt/1.4.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1124 Lines: 42 --PEIAKu/WMn1b1Hv9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline the attached patch fixes long scheduling latencies in pty_read()caused by the BKL. has been tested as part of the -VP patchset and in earlier -mm trees. Ingo --PEIAKu/WMn1b1Hv9 Content-Type: text/plain; charset=us-ascii Content-Disposition: attachment; filename="fix-latency-pty.patch" the attached patch fixes long scheduling latencies in pty_read()caused by the BKL. has been tested as part of the -VP patchset and in earlier -mm trees. Signed-off-by: Ingo Molnar --- linux/drivers/char/pty.c.orig +++ linux/drivers/char/pty.c @@ -139,6 +139,7 @@ static int pty_write(struct tty_struct * c += n; count -= n; to->ldisc.receive_buf(to, temp_buffer, NULL, n); + cond_resched(); } up(&tty->flip.pty_sem); } else { --PEIAKu/WMn1b1Hv9-- - 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/