From: Nick Piggin <piggin@cyberone.com.au>

This one gathers better statistics about the new process problem.  It
improves estimation for initial process IO.  That is, better calculations
for whether it will be worth waiting after a process submits its first
read.

This is done with a per queue average thinktime and seek time for a second
read submitted from a process.

When combined with 3/3, numbers are around the same as mm1 for most long
lived tasks, but much better for things like the top 4 benchmarks.

Probably wants rwhron and the OSDL database guys to give it some testing.

test                                    2.6.0-test9-mm1  2.6.0-test9-mm1-np
Cat kernel source during seq read       0:26.89          0:24.75
Cat kernel source during seq write      9:17.80          0:23.48
ls -lr kernel source during seq read    0:11.03          0:14.68
ls -lr kernel source during seq write   0:49.95          0:08.06

contest no_load                         143s 0 loads     144s 0 loads
contest io_load                         193s 40.2 loads  193s 40.1 loads
contest read_load                       186s 11.6 loads  190s 10.5 loads
contest list_load                       201s 5.0 loads   200s 5.0 loads

pgbench 1 client                        31.3TPS          31.5TPS
pgbench 4 clients                       37.7TPS          37.5TPS
pgbench 16 clients                      42.1TPS          48.1TPS

From: Nick Piggin <piggin@cyberone.com.au>

This fixes all known bugs with as in mm2.  That constitutes small fixes for
2 WARNs getting triggered.  It looks like Prakash's lost interrupt problem
was due to as spewing bazillions of warnings, and he must have had his
kernel.printk configured not to show them or something.  I have to just get
final confirmation from him that this final cut of the patch fixes his
problem too.

From: Nick Piggin <piggin@cyberone.com.au>

From: Nick Piggin <piggin@cyberone.com.au>

I have tested this on my disks and cdroms, but they don't represent
what all drivers might do. I have asked Jarkko Lehti with his dvd writing
problem to try it...

From: Nick Piggin <piggin@cyberone.com.au>

Randy has just reported that this fixes up his regression. Its now as good
as test5 in his tests with this patch. He is also seeing quite large
increases (above test5) when IO scheduler barriers are disabled (this patch
doesn't do that). Perhaps something is using them too liberally.

Anyway, this reverts AS back to defaulting to not anticipate IO for a
program that submits its first request (this really hurts find | xargs grep
sort of things).  I am working on something to fix this up properly.  That
can go in after 2.6.0 anyway.

Use daemonize() rather than open-coding half of it.

(I don't know if this has been tested - it has been in -mm for three months).

From: Anton Blanchard <anton@samba.org>

vi fixup

From: Anton Blanchard <anton@samba.org>

Gone are the days of initialising stuff we touch in prom_init just
to keep it out of the BSS. There are a few things the hypervisor
writes to in the iseries case, hard code them into the data segment
and add a comment.

Remove the -fno-zero-initialized-in-bss hack, it was required when
gcc got smart and put zero initialised stuff into the BSS

From: Anton Blanchard <anton@samba.org>

Fixed rtas_extended_busy_delay_time() to calculate correct value, from John
Rose

From: Anton Blanchard <anton@samba.org>

Xmon changes to make breakpoints and single-stepping work on pSeries LPARs.
Also changed help text to reflect obsolete cmds.

From: Anton Blanchard <anton@samba.org>

Looks like glibc is using stat in some places, so we should modify
it to copy the nanosecond fields. Also speed up stat by only checking
the region once instead of each put_user call.

From: Anton Blanchard <anton@samba.org>

correct epoll syscall names

From: Anton Blanchard <anton@samba.org>

setup_cpu was being called for the boot cpu after all other cpus had been
spun up.  The init thread can sleep during secondary cpu spinup (eg migration
thread init) and sometimes the init thread would switch to another cpu at
this time.  The end result was setup_cpu was called twice on one cpu and
never on the boot cpu.

The original fix called setup_cpu on the boot cpu before all others but that
wont work for G5, so we now use cpu affinity calls to enforce it.

From: Anton Blanchard <anton@samba.org>

- Remove a bunch of unnecessary sections
- Always declare section labels inside the section (bug found on ppc32)
- Rearrange sections to waste less space

From: Anton Blanchard <anton@samba.org>

 - remove old checks target, no longer used
 - add -mtraceback=none, we dont use traceback tables any more
 - add check for -mcpu=power4, older toolchains dont support this option

From: Anton Blanchard <anton@samba.org>

Use an atomic_t instead of a volatile unsigned long, from Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

Fix a compile error and a warning in the iSeries code, from Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

Check range of PCI memory and I/O accesses on iSeries, from Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

prom_panic(), from Todd Inglett

From: Anton Blanchard <anton@samba.org>

Tidy up the mf_proc code, from Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

Rewrite __hash_page function in assembly in such a way we don't need
the page table lock any more. We now rely on a BUSY bit in the linux
PTE on which we spin on when doing an update of the PTE

[PATCH] ppc64: Fix {pte,pmd}_free vs. hash_page race by relaying actual deallocation with RCU, from Ben Herrenschmidt

From: Anton Blanchard <anton@samba.org>

Fix {pte,pmd}_free vs.  hash_page race by relaying actual deallocation with
RCU, from Ben Herrenschmidt

From: Anton Blanchard <anton@samba.org>

VMX (Altivec) support & signal32 rework, from Ben Herrenschmidt

From: Anton Blanchard <anton@samba.org>

Binutils uses the recent mtcrf optimisation when compiling for a POWER4
target.  Unfortunately this causes a program check on POWER3.  We required
compiling for POWER4 so the tlbiel instruction would be recognised.

For the moment we hardwire the tlbiel instruction, longer term we can use the
binutils -many flag.

[PATCH] ppc64: Update the surveillance boot parameter to allow all valid settings of the surveillance timeout, from Nathan Fontenot

From: Anton Blanchard <anton@samba.org>

Update the surveillance boot parameter to allow all valid settings of the
surveillance timeout, from Nathan Fontenot

From: Anton Blanchard <anton@samba.org>

add/forward port of lparcfg, from Will Schmidt

From: Anton Blanchard <anton@samba.org>

Get native PCI going on iSeries, from Paul Mackerras

From: Anton Blanchard <anton@samba.org>

Add virtual I/O support.  These routines provide the infrastructure
needed by virtual SCSI, virtual ethernet, virtual serial on IBM
pSeries servers

From: Anton Blanchard <anton@samba.org>

add hcall interface

From: Anton Blanchard <anton@samba.org>

Small cleanups to iSeries virtual ethernet driver, from Dave Gibson

[PATCH] ppc64: Tidy up various bits of the iSeries code. No significant code changes, from Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

Tidy up various bits of the iSeries code.  No significant code changes, from
Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

fix a couple small OF device tree bugs which were overlooked, from Joel Schopp

From: Anton Blanchard <anton@samba.org>

iSeries fixes, from Stephen Rothwell

From: Anton Blanchard <anton@samba.org>

Add additional hypervisor call constants, from Dave Boutcher

From: Anton Blanchard <anton@samba.org>

Preliminary iSeries support.  Still a bit hackish in parts but it does
compile.  The viodasd driver is almost completely untested so don't trust it
with your data.

From: Anton Blanchard <anton@samba.org>

This is a port of the nvram buffering/error logging code from 2.4 to 2.6.  It
includes moving /proc/rtas to /proc/ppc64/rtas and making /proc/rtas a
symlink to /proc/ppc64/rtas.  It also splits up the /dev/nvram device
read/write functions from the basic nvram access functions, and adds ppc_md
fields for the nvram access functions.

[PATCH] ppc64: one instruction fix for synchronization bug found during cpu DLPAR development, from Joel Schopp

From: Anton Blanchard <anton@samba.org>

one instruction fix for synchronization bug found during cpu DLPAR
development, from Joel Schopp

From: Anton Blanchard <anton@samba.org>

Add VMX registers to sigcontext, from Steve Munroe

From: Anton Blanchard <anton@samba.org>

Minor fixes to make the UP case compile, export cpu_possible_map, fix up
whitespace etc.

From: Anton Blanchard <anton@samba.org>

And SMT processor support & move back to a logical cpu numbering
in support of DLPAR work.