Re: [patch] O(1) scheduler, 2.4.17-A1, 2.5.2-pre7-A1.

From: Andrey Nekrasov (
Date: Fri Jan 04 2002 - 12:38:51 EST

Hello Ingo Molnar,

2.4.17 + A1 patch:

gcc -D__KERNEL__ -I/usr/src/linux-2.4.17-A1/include -Wall -Wstrict-prototypes
-Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe
-mpreferred-stack-boundary=2 -march=i686 -c -o syncookies.o syncookies.c
gcc -D__KERNEL__ -I/usr/src/linux-2.4.17-A1/include -Wall -Wstrict-prototypes
-Wno-trigraphs -O2 -fomit-frame-pointer -fno-strict-aliasing -fno-common -pipe
-mpreferred-stack-boundary=2 -march=i686 -c -o ipconfig.o ipconfig.c
ipconfig.c: In function `ip_auto_config':
ipconfig.c:1148: `UNNAMED_MAJOR' undeclared (first use in this function)
ipconfig.c:1148: (Each undeclared identifier is reported only once
ipconfig.c:1148: for each function it appears in.)
make[3]: *** [ipconfig.o] Error 1
make[3]: Leaving directory `/usr/src/linux-2.4.17-A1/net/ipv4'
make[2]: *** [first_rule] Error 2
make[2]: Leaving directory `/usr/src/linux-2.4.17-A1/net/ipv4'
make[1]: *** [_subdir_ipv4] Error 2
make[1]: Leaving directory `/usr/src/linux-2.4.17-A1/net'
make: *** [_dir_net] Error 2
suse:/usr/src/linux #

ps. vanilla kernel compile ok.

Once you wrote about "[patch] O(1) scheduler, 2.4.17-A1, 2.5.2-pre7-A1.":
> this is the next release of the O(1) scheduler:
> this release includes fixes and small improvements. (The 2.5.2-A1 patch is
> against the 2.5.2-pre7 kernel.) I cannot reproduce any more failures with
> this patch, but i couldnt test the vfat lockup problem. The X lockup
> problem never occured on any of my boxes, but it might be fixed by one of
> the changes included in this patch nevertheless.
> Changes:
> - idle process notification fixes. This fixes the idle=poll breakage
> reported by Anton Blanchard.
> - fix a bug in setscheduler() which crashed if a non-SCHED_OTHER task did
> a setscheduler() call. This fixes the crash reported by Randy Hron. The
> Linux Test Project's syscall tests do not cause a crash anymore.
> - do some more unlikely()/likely() tagging of branches along the hotpath,
> suggested by Jeff Garzik.
> - fix the compile failures in md.c and loop.c and other files, reported
> by many people.
> - fix the too-big-by-one error in the bitmat sizing define, noticed by
> Anton Blanchard.
> - fix a bug in rt_lock() + setscheduler() that had a potential for a
> spinlock lockup.
> - introduce the idle_tick() function, so that idle CPUs can do
> load-balancing as well.
> - do LINUX_VERSION_CODE checking in jffs2 (Jeff Garzik)
> - optimize the big-kernel-lock releasing/acquiring code some more. From
> now on it's absolutely illegal to schedule() from cli()-ed code. (not
> that it was legal.) This moves a few instructions off the scheduler
> hotpath.
> - move the ->need_resched setting into idle_init().
> - do not clear RT tasks in reparent_to_init(). There's nothing bad with
> running RT tasks in the background.
> - RT task's priority order was inverted, it should be 0-99, not 99-0.
> - make load-balancing a bit less eager when there are lots of processes
> running: it needs a ~10% imbalance in runqueue lengths to trigger a
> rebalance.
> - (there is a small hack in serial.c in the 2.5.2-pre7 patch, to make it
> compile.)
> Comments, bug reports, suggestions are welcome,
> Ingo
> -
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Andrey Nekrasov, SpyLOG.
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