linux-kernel - Re: [PATCH] kernel/sys: Replace hardcoding of 20 with MAX

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Date:	Mon, 10 Mar 2014 19:21:05 -0700
From:	Joe Perches <joe@...ches.com>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, fweisbec@...il.com,
	rostedt@...dmis.org, peterz@...radead.org, mingo@...hat.com
Subject: Re: [PATCH] kernel/sys: Replace hardcoding of 20 with MAX_NICE + 1

On Tue, 2014-03-11 at 09:17 +0800, Dongsheng Yang wrote:
> Hi Joe,
> 
> On 03/11/2014 06:23 AM, Joe Perches wrote:
> > Convert the use of 20 to NICE_MAX + 1.
> 
> What about adding a macro in prio.h to convert nice value [19,-20] to 
> rlimit
> style value [1,40]?
> 
> It seems that it will be used in several places.

Fine by me.  knock yourself out.

You might also consider changing these:

$ git grep -n -w -E "19|20"|grep -P "_nice" -i
drivers/block/loop.c:551:	set_user_nice(current, -20);
drivers/block/nbd.c:536:	set_user_nice(current, -20);
drivers/block/pktcdvd.c:1466:	set_user_nice(current, -20);
drivers/char/ipmi/ipmi_si_intf.c:1001:	set_user_nice(current, 19);
drivers/s390/crypto/ap_bus.c:1806:	set_user_nice(current, 19);
drivers/scsi/bnx2fc/bnx2fc_fcoe.c:467:	set_user_nice(current, -20);
drivers/scsi/bnx2fc/bnx2fc_fcoe.c:605:	set_user_nice(current, -20);
drivers/scsi/bnx2i/bnx2i_hwi.c:1873:	set_user_nice(current, -20);
drivers/scsi/fcoe/fcoe.c:1875:	set_user_nice(current, -20);
drivers/scsi/ibmvscsi/ibmvfc.c:4518:	set_user_nice(current, -20);
drivers/scsi/ibmvscsi/ibmvscsi.c:2216:	set_user_nice(current, -20);
drivers/scsi/lpfc/lpfc_hbadisc.c:736:	set_user_nice(current, -20);
drivers/scsi/qla2xxx/qla_os.c:4759:	set_user_nice(current, -20);
drivers/staging/android/binder.c:439:	min_nice = 20 - current->signal->rlim[RLIMIT_NICE].rlim_cur;
drivers/staging/android/binder.c:444:	if (min_nice < 20)
drivers/staging/lustre/lustre/llite/lloop.c:410:	set_user_nice(current, -20);
fs/ocfs2/cluster/heartbeat.c:1110:	set_user_nice(current, -20);
include/linux/ioprio.h:55:	return (task_nice(task) + 20) / 5;
include/linux/sched/prio.h:4:#define MAX_NICE	19
include/linux/sched/prio.h:5:#define MIN_NICE	-20
kernel/locking/locktorture.c:219:	set_user_nice(current, 19);
kernel/sys.c:253:				niceval = 20 - task_nice(p);
kernel/sys.c:264:				niceval = 20 - task_nice(p);
kernel/sys.c:280:					niceval = 20 - task_nice(p);
kernel/workqueue.c:105:	RESCUER_NICE_LEVEL	= -20,
kernel/workqueue.c:106:	HIGHPRI_NICE_LEVEL	= -20,
tools/testing/selftests/mqueue/mq_perf_tests.c:532:	cur_nice = -20;


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