linux-kernel - [PATCH 2.6.21] Return available first timeslice to the creator, not parent

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Message-ID: <m3fy21qx4p.fsf@dhcp-lab-143.englab.brq.redhat.com>
Date:	Thu, 30 Aug 2007 09:50:30 +0200
From:	Vitaly Mayatskikh <vmayatsk@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 2.6.21] Return available first timeslice to the creator, not parent


Short-living process returns its timeslice to the parent, this affects process that creates a lot of such short-living threads, because its not a parent for new threads. Patch fixes this issue and doesn't break kabi as does the patch from reporter: http://lkml.org/lkml/2007/4/7/21

An example and script for systemtap were modified a bit. Patch was tested on 2.6.21 with results:

Pass 1: parsed user script and 54 library script(s) in 330usr/10sys/340real ms.
Pass 2: analyzed script: 3 probe(s), 10 function(s), 0 embed(s), 10 global(s) in 540usr/890sys/1445real ms.
Pass 3: translated to C into "/tmp/stapg9EJ30/stap_09f64923e2e59e40ae9680eee1ee0ac9_7206.c" in 10usr/0sys/5real ms.
Pass 4: compiled C into "stap_09f64923e2e59e40ae9680eee1ee0ac9_7206.ko" in 2880usr/250sys/3124real ms.
Pass 5: starting run.
sched_exit/enter:  pid = 16625, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16625, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16626, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16626, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16627, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16627, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16628, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16628, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16629, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16629, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16637, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16637, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16638, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16638, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16639, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16639, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16640, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16640, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16641, tgid = 16623, ppid = 3761, creator = 16624, avail. timeslice = 6, creator's timeslice = 5
sched_exit/return: pid = 16641, tgid = 16623, ppid = 3761, creator = 16624, creator's adjusted timeslice = 11
sched_exit/enter:  pid = 16624, tgid = 16623, ppid = 3761, creator = 16623, avail. timeslice = 11, creator's timeslice = 10
sched_exit/return: pid = 16624, tgid = 16623, ppid = 3761, creator = 16623, creator's adjusted timeslice = 21
sched_exit/enter:  pid = 16623, tgid = 16623, ppid = 3761, creator = 3761, avail. timeslice = 21, creator's timeslice = 21
sched_exit/return: pid = 16623, tgid = 16623, ppid = 3761, creator = 3761, creator's adjusted timeslice = 42
Pass 5: run completed in 40usr/150sys/4266real ms.


View attachment "2.6.21-timeslice.patch" of type "text/plain" (3490 bytes)

View attachment "satthread.c" of type "text/plain" (1174 bytes)

View attachment "fork_exit21.stp" of type "text/plain" (1586 bytes)

Content of type "application/pgp-signature" skipped



-- 
Vitaly Mayatskikh <vmayatsk@...hat.com>

Kernel development
Red Hat Czech, Brno

Phone: +420 532 294 111
IRC: vitaly on #kernel, #brno
GPG: 0x4BA2E8FB