linux-kernel - Re: [PATCH] make setpriority POSIX compliant; introduce PRIO

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Date:	Mon, 01 Sep 2008 16:17:58 +0200
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] make setpriority POSIX compliant; introduce
	PRIO_THREAD extension

On Mon, 2008-09-01 at 16:12 +0200, Denys Vlasenko wrote:
> Patch is run tested. I will post test program etc as a reply.

Test program is attached.
Build with "gcc -o prio_vda3 prio_vda3.c -lpthread".
Output:

start test program
CHILD1: TID:3269 getpriority:0
CHILD1: PID:3269 getpriority:0
setpriority(PRIO_PROCESS, 3269, -10)
THREAD CHILD: TID:3270 getpriority:-2
THREAD CHILD: PID:3269 getpriority:-10
THREAD CHILD: TID:3271 getpriority:-4
THREAD CHILD: PID:3269 getpriority:-10
THREAD CHILD: TID:3272 getpriority:-6
THREAD CHILD: PID:3269 getpriority:-10
THREAD CHILD: TID:3273 getpriority:-8
THREAD CHILD: PID:3269 getpriority:-10
CHILD2: TID:3269 getpriority:-10
CHILD2: PID:3269 getpriority:-10
Joined!
Joined!
Joined!
Joined!

log of instrumented kernel:

 (no threads created yet, only one tid exists)
 getpriority:
PRIO_PROCESS: pid 3269 tgid 3269: niceval=20
PRIO_PROCESS: returning retval=20
PRIO_PROCESS: pid 3269 tgid 3269: niceval=20
PRIO_PROCESS: returning retval=20
 (5 threads are created)
 setpriority(PRIO_PROCESS, pid, -10):
setting prio of pid 3269 tgid 3269 to -10
setting prio of pid 3270 tgid 3269 to -10
setting prio of pid 3271 tgid 3269 to -10
setting prio of pid 3272 tgid 3269 to -10
setting prio of pid 3273 tgid 3269 to -10
 setpriority(3 /*PRIO_THREAD*/, syscall(SYS_gettid), -1);
setting prio of pid 3270 tgid 3269 to -1
 setpriority(PRIO_PROCESS, syscall(SYS_gettid), -2);
setting prio of pid 3270 tgid 3269 to -2

Above you see how setpriority(PRIO_PROCESS) can set prio for all threads
or only for one.

  prio = getpriority(PRIO_PROCESS, tid);
PRIO_PROCESS: pid 3270 tgid 3269: niceval=22
PRIO_PROCESS: returning retval=22
  prio = getpriority(PRIO_PROCESS, pid);
PRIO_PROCESS: pid 3269 tgid 3269: niceval=30
PRIO_PROCESS: pid 3270 tgid 3269: niceval=22
PRIO_PROCESS: pid 3271 tgid 3269: niceval=30
PRIO_PROCESS: pid 3272 tgid 3269: niceval=30
PRIO_PROCESS: pid 3273 tgid 3269: niceval=30
PRIO_PROCESS: returning retval=30

Same for getpriority.

The rest is analogous:

setting prio of pid 3271 tgid 3269 to -3
setting prio of pid 3271 tgid 3269 to -4
PRIO_PROCESS: pid 3271 tgid 3269: niceval=24
PRIO_PROCESS: returning retval=24
PRIO_PROCESS: pid 3269 tgid 3269: niceval=30
PRIO_PROCESS: pid 3271 tgid 3269: niceval=24
PRIO_PROCESS: pid 3272 tgid 3269: niceval=30
PRIO_PROCESS: pid 3273 tgid 3269: niceval=30
PRIO_PROCESS: returning retval=30
setting prio of pid 3272 tgid 3269 to -5
setting prio of pid 3272 tgid 3269 to -6
PRIO_PROCESS: pid 3272 tgid 3269: niceval=26
PRIO_PROCESS: returning retval=26
PRIO_PROCESS: pid 3269 tgid 3269: niceval=30
PRIO_PROCESS: pid 3272 tgid 3269: niceval=26
PRIO_PROCESS: pid 3273 tgid 3269: niceval=30
PRIO_PROCESS: returning retval=30
setting prio of pid 3273 tgid 3269 to -7
setting prio of pid 3273 tgid 3269 to -8
PRIO_PROCESS: pid 3273 tgid 3269: niceval=28
PRIO_PROCESS: returning retval=28
PRIO_PROCESS: pid 3269 tgid 3269: niceval=30
PRIO_PROCESS: pid 3273 tgid 3269: niceval=28
PRIO_PROCESS: returning retval=30
PRIO_PROCESS: pid 3269 tgid 3269: niceval=30
PRIO_PROCESS: returning retval=30
PRIO_PROCESS: pid 3269 tgid 3269: niceval=30
PRIO_PROCESS: returning retval=30

Patch with instrumentation is attached too.
--
vda



View attachment "prio_vda3.c" of type "text/x-csrc" (1632 bytes)

View attachment "setprio_POSIX_instrumented.diff" of type "text/x-patch" (1673 bytes)