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Commit 47083fc0 authored by Jesper Dangaard Brouer's avatar Jesper Dangaard Brouer Committed by David S. Miller
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pkt_sched: Change HTB_HYSTERESIS to a runtime parameter htb_hysteresis. 



Add a htb_hysteresis parameter to htb_sch.ko and by sysfs magic make
it runtime adjustable via
/sys/module/sch_htb/parameters/htb_hysteresis mode 640.

Signed-off-by: default avatarJesper Dangaard Brouer <hawk@comx.dk>
Acked-by: default avatarMartin Devera <devik@cdi.cz>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f9ffcedd

net/sched/sch_htb.c

+15 −8
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
 * $Id: sch_htb.c,v 1.25 2003/12/07 11:08:25 devik Exp devik $

 */

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/string.h>
@@ -53,13 +54,17 @@ 
*/



#define HTB_HSIZE 16		/* classid hash size */

#define HTB_HYSTERESIS 0	/* whether to use mode hysteresis for speedup */

static int htb_hysteresis __read_mostly = 0; /* whether to use mode hysteresis for speedup */

#define HTB_VER 0x30011		/* major must be matched with number suplied by TC as version */



#if HTB_VER >> 16 != TC_HTB_PROTOVER

#error "Mismatched sch_htb.c and pkt_sch.h"

#endif



/* Module parameter and sysfs export */

module_param    (htb_hysteresis, int, 0640);

MODULE_PARM_DESC(htb_hysteresis, "Hysteresis mode, less CPU load, less accurate");



/* used internaly to keep status of single class */

enum htb_cmode {

	HTB_CANT_SEND,		/* class can't send and can't borrow */
@@ -462,19 +467,21 @@ static void htb_deactivate_prios(struct htb_sched *q, struct htb_class *cl) 
		htb_remove_class_from_row(q, cl, mask);

}



#if HTB_HYSTERESIS

static inline long htb_lowater(const struct htb_class *cl)

{

	if (htb_hysteresis)

		return cl->cmode != HTB_CANT_SEND ? -cl->cbuffer : 0;

	else

		return 0;

}

static inline long htb_hiwater(const struct htb_class *cl)

{

	if (htb_hysteresis)

		return cl->cmode == HTB_CAN_SEND ? -cl->buffer : 0;

	else

		return 0;

}

#else

#define htb_lowater(cl)	(0)

#define htb_hiwater(cl)	(0)

#endif





/**

 * htb_class_mode - computes and returns current class mode