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Text 3150, 189 rader
Skriven 2005-08-29 11:21:04 av Kenneth Parrish (8:8/2)
Ärende: 2.6.13-ck1
==================
 * Originally in: linux.kernel
 * Originally on: 29 Aug 05  05:10:06
 * Originally by: Con Kolivas
 * MIME noncompliance damage all reversed? =3D=3D -- k.p. =20:)

From: Con Kolivas <kernel@kolivas.org>

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These are patches designed to improve system responsiveness and interactivi ty.
It is configurable to any workload but the default ck* patch is aimed at the
desktop and ck*-server is available with more emphasis on serverspace.


Apply to 2.6.13
http://ck.kolivas.org/patches/2.6/2.6.13/2.6.13-ck1/patch-2.6.13-ck1.bz2
or development version:
http://ck.kolivas.org/patches/2.6/2.6.13/2.6.13-ck1/patch-2.6.13-ck1+.bz2

or server version:
http://ck.kolivas.org/patches/2.6/2.6.13/2.6.13-ck1/patch-2.6.13-ck1-server
  2Ebz2


web:
http://kernel.kolivas.org
all patches:
http://ck.kolivas.org/patches/
Split patches available.


Changes since 2.6.12-ck6:

Changed:
 -2.6.12_to_staircase11.3.diff
 +2.6.13_to_staircase12.diff
Minor cleanups. Restore 10ms round robin intervals. 5ms, while giving better
interactive feel, caused problems on dual core amd64 and 250Hz (for reasons
that I have yet to track down). The ck1+ patch has 5ms RR intervals.

 -smp-nice-support6.diff
 -smpnice6-smpnice7.diff
 +smp-nice-support7.diff
Rollup

 -batch_ionice.diff
 +isobatch_ionice2.diff
Update the link between i/o priorities and SCHED_ISO

 -mapped_watermark3.diff
This has been replaced with the split out patches that build on this work:

 +vm-mapped.diff
Turn the "swappiness" knob into one with well defined semantics. Rename it
"mapped" to correspond directly with the percentage of mapped ram or
"applications" as users think of it. Currently the swappiness algorithm can
easily lead to swapping situations on simple file copies due to the distress
algorithm which too easily overrides the swappiness value. Add a "hardmaplimit"
tunable, on by default, which only allows the vm to override the "mapped"
tunable when distress is at its greatest to prevent false out-of-memory
situations.

 +vm-lots_watermark.diff
The vm currently performs scanning when allocating ram once the watermarks are
below the pages_low value and tries to restore them to the pages_high
watermark. The disadvantage of this is that we are scanning most aggresssiv ely
at the same time we are allocating ram regardless of the stress the vm is
under. Add a pages_lots watermark and allow the watermark to be relaxed
according to the stress the vm is at the time (according to the priority
value). Thus we have more in reserve next time we are allocating ram and end up
scanning less aggresssively.


Added:
 +sched-iso3.1.patch
Here is a complete rewrite of the SCHED_ISO code. Having dropped SCHED_ISO in
the stable series in preference for RT RLIMITS it was clear that there is still
indication for SCHED_ISO for the following reasons: It provides real-time
performance without risking starvation/DoS It is much easier to set up than RT
RLIMITS without any knowledge and you c an benefit from it without knowing
anything about it (unprivileged tasks tryin g to start real time get demoted to
SCHED_ISO) Userspace support for it is here and now

This version of SCHED_ISO is actually much more robust than the one in previous
-ck kernels which just had a lowish latency version of SCHED_NORMA L. SCHED_ISO
tasks now actually run like real time tasks at the equivalent priority as nice
-20 tasks unless they use more than 70% of the cpu for a rolling 3 second time
period. Then they're demoted to behave like SCHED_NOR MAL tasks.

 +vm-background_scan.diff
Add a background scanning timer to restore the watermarks to the pages_lots
level and only call on it if kswapd has not been called upon for the last 5
seconds. This allows us to balance all zones to the more generous pages_lots
watermark at a time unrelated to page allocation thus leading to lighter levels
of vm load when called upon under page allocation.

 +pdflush-tweaks.patch
The speed we write out dirty data to disk can clash with the average time disk
journals write out. This tweaks it to write out dirty data slightly more
frequently and minimise prolonged write starvation.

 +hz-default_values.patch
Hz is now configurable, so set some useful defaults as 250 is no good to either
desktop or server. Set 1000 for most desktop architectures (or 100 in
ck-server).

 +2613ck1-version.diff
Version


Rolled into mainline or above patches or removed:
 -cfq-2.6.12-mm1.patch
 -sched-fix_up_build.patch
 -cfq-ts-2.diff
 -cfq-ts-4.diff
 -s11.3_s11.4.diff
 -s11.4_s11.6.diff
 -patch-2.6.12.5.bz2
 -2612ck6-version.diff


In 2.6.13-ck1+ only:
 +sched-staircase12_tweak.patch
As mentioned above, set round robin intervals to 5ms (unsuitable on some
hardware). Please try and if you have problems, email me with information.

 +vm-swap-prefetch.patch
This patch stores a list of ram that is put to swap and if the memory subsystem
is idle for a time it starts swapping the ram pages back in gently in the
reverse order they went out. The idea is that when you come back to your pc
after it has been idle for a while, if any applications have been swapped out
they should have swapped back in quietly. It does not delete the page entries
from the swap so that if there is any stress, these pages can effectively be
swapped back out for free without further disk access. The patch is still new
so has had limited testing only. Please test and report back. This depends on
the previous 2 vm patches to patch cleanly.


  Full patchlist:
sched-run_normal_with_rt_on_sibling.diff
2.6.13_to_staircase12.diff
schedrange.diff
schedbatch2.9.diff
sched-iso3.1.patch
smp-nice-support7.diff
1g_lowmem1_i386.diff
defaultcfq.diff
isobatch_ionice2.diff
rt_ionice.diff
pdflush-tweaks.patch
hz-default_values.patch
vm-mapped.diff
vm-lots_watermark.diff
vm-background_scan.diff
2613ck1-version.diff
vm-swap-prefetch.patch
sched-staircase12_tweak.patch


Cheers,
Con Kolivas

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