Messages in this thread Patch in this message | | | Date | Thu, 7 Aug 2003 01:40:36 +0200 | From | Pavel Machek <> | Subject | Re: Disk priority dependend on nice level... |
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Hi!
> I ported `subj` to 2.6.0-test2. I do not yet have idea if it works, > but it compiles ;-).
It compiles, it event boots, but it does not seem to have much effect :-(.
Test was like this:
bench: #!/bin/bash doit() { echo Unloaded system: time ./$1 echo No nice: ./$1 loadonly & time ./$1 killall $1 killall bench_cat echo Nice -19: nice -n 19 ./$1 loadonly & time ./$1 killall $1 killall bench_cat }
doit diskload
diskload: #!/bin/bash if [ "a$1" == aloadonly ]; then ./bench_cat /usr/{bin,lib,lib/*}/* > /dev/null 2> /dev/null exit fi umount /suse mount /suse ./bench_cat /suse/usr/bin/* > /dev/null 2> /dev/null
bench_cat is copy of /bin/cat. Pavel
> > --- clean/drivers/block/deadline-iosched.c 2003-07-27 22:31:10.000000000 +0200 > +++ linux/drivers/block/deadline-iosched.c 2003-08-07 01:26:47.000000000 +0200 > @@ -17,6 +17,7 @@ > #include <linux/compiler.h> > #include <linux/hash.h> > #include <linux/rbtree.h> > +#include <linux/sched.h> > > /* > * See Documentation/deadline-iosched.txt > @@ -106,6 +107,19 @@ > #define RQ_DATA(rq) ((struct deadline_rq *) (rq)->elevator_private) > > /* > + * scale_deadline > + */ > +static int scale_deadline(int default_deadline) > +{ > + int prio = current->static_prio - MAX_RT_PRIO; > + /* make priorities higher than nice -10 equal to nice -10 */ > + if (prio < 10) > + prio = 10; > + /* scale the deadline according to priority */ > + return default_deadline * prio/20; > +} > + > +/* > * the back merge hash support functions > */ > static inline void __deadline_del_drq_hash(struct deadline_rq *drq) > @@ -303,7 +317,7 @@ > /* > * set expire time (only used for reads) and add to fifo list > */ > - drq->expires = jiffies + dd->fifo_expire[data_dir]; > + drq->expires = jiffies + scale_deadline(dd->fifo_expire[data_dir]); > list_add_tail(&drq->fifo, &dd->fifo_list[data_dir]); > } > >
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