The main features of 2.2.13aa6 are:
o Support for 4Gigabyte of RAM (me and Gerhard.Wichert)
o Improved VM for high end machines with enough ram and doing
heavy I/O under high memory pressure (me)
o RAW-IO (also on bigmem) (Stephen C. Tweedie)
o updated with all showstopper/necessary bugfixes discovered into
the 2.2.x kernels over the time.
NOTE (2.2.14pre): if you don't need the 4g support and raw-io and your
machine has a workstation load (so you don't do heavy I/O) you should
ignore 2.2.13aa6 and I suggest to use 2.2.14pre14 plus my
block_dev-fs-corruption patch.
NOTE (raid): if you want to use the latest raid patches
(raid0145-19990824-2.2.11) over 2.2.13aa6 simply apply the raid patch over
2.2.13aa6 and then apply this incremental patch on the resulting kernel:
ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/patches/v2.2/2.2.14pre11/set_blocksize-1-raid0145-19990824-2.2.11.gz
Then raid will work just fine.
Side note: I am not including the new raid code in 2.2.x because at least
raid0 is just rock solid in the stock 2.2.13 kernel and I don't want to
force people to convert the on-disk format of their raid device in order
to run 2.2.13aa6. People who wants to use raid can go with my incremental
raid fix.
Incremental description of 2.2.13aa6:
------ 2.2.13aa6 --------
diff -u --exclude version.gz 2.2.13aa5 2.2.13aa6
Only in 2.2.13aa6: block_dev-fs-corruption-1.gz
block_dev-fs-corruption-1.gz -> fixes fs corruption in the
blockdevice layer (me)
------ 2.2.13aa5 --------
diff -u --exclude version.gz 2.2.13aa4 2.2.13aa5
Only in 2.2.13aa4: buffer-races-2.2.10-A.gz
Only in 2.2.13aa5: buffer-races-2.2.13-3.gz
Only in 2.2.13aa5: ext2-1.gz
buffer-races-2.2.13-3.gz -> includes the
buffer-races-2.2.10-A.gz
features and it also fixes fs
corruption generated by hdparm or
flushb on an active filesystem and
a minor problem in sync_dev (me)
ext2-1.gz -> fixes bugs that may lead to
ext2 fs corruption or
fsync errors (me)
------ 2.2.13aa5 --------
diff -u --exclude version.gz 2.2.13aa3 2.2.13aa4
Only in 2.2.13aa4: inode-recycle-fixes.gz
Only in 2.2.13aa4: java-proc.gz
Only in 2.2.13aa4: signal-race.gz
Only in 2.2.13aa4: syncookies.gz
inode-recycle-fixes.gz -> fixes an inode leakage (me)
syncookies.gz -> fixed syncooky bug (without the
fix at the first synflood
the machine will forbid
connections to all hosts, must
check only the SYN/ACK/FIN
bit and not the data offset
and window of the incoming
packet ;). (Alan Cox)
signal-race.gz -> fixes a race in the send sig path
(David Miller)
java-proc.gz -> revertd the semantic change that
make difference between
/proc/00000$$ and /proc/$$, this
allows backwards compatibilty of
a misfeature and it _won't_ hurt
security. There's no downside
in reverting the 2.2.13 semantic
change.
------ 2.2.13aa3 --------
diff -u --exclude version.gz 2.2.13aa2 2.2.13aa3
Only in 2.2.13aa3: dcache-hashfn.gz
Only in 2.2.13aa3: fdset-fix.gz
Only in 2.2.13aa2: z-bigmem-2.2.13aa2-6.gz
Only in 2.2.13aa3: z-bigmem-2.2.13aa3-7.gz
z-bigmem-2.2.13aa3-7.gz -> fixed a obvious silly bigmem
bug that will lead
to processes killed randomly.
(all the credit goes to Leonard N.
Zubkoff)
fdset-fix.gz -> fixed a fdset bug that may lead to
memory corruption and Oopses
(credits goes to
Savochkin Andrey Vladimirovich,
I only backported the 2.3.x patch
to a four liner against 2.3.13)
dcache-hashfn.gz -> use only the dentry noise for
randomizing the dcache hashfn
(all the credit goes to David S.
Miller)
------ 2.2.13aa2 --------
SMP-scheduler-2.2.11-E.gz -> rewrote of reschedule_idle. (me)
buffer-hash.gz -> fixes lowmem box hash size. (me)
buffer-races-2.2.10-A.gz -> fixes of race condition that may lead
to bad things in invalidate_buffers()
and set_blocksize(). (me)
clear-backlog-2.gz -> fixes for a SMP race condition in
the main network backlog handling. (me)
dcache-hash.gz -> dcache hash dynamic (with my
own heuristc). (started from 2.2.13ac1
but then reimplemented by me)
free_page.gz -> cleanup of the __free_pages
interface. (me)
hashed-buffers-2.2.10.gz -> minor fix to increase the debugging
information in the right place. (me)
inode-leak-2.2.10-A.gz -> make sure to not leak memory
by allocating lots of sockets (DoS),
and let know the admin to enlarge
the max-inodes if the admin really
wants more unfreeable memory in the
icache. (me)
kupdate-sigstop-2.2.11-1.gz -> allow kupdate to be stopped via
SIGSTOP (currently it must be stopped
by setting interval to zero via
sysctl). (me)
no-swapout-2.2.10-B.gz -> avoid swapin/swapouts during heavy
I/O (strictly necessary for decent
performances on very I/O and MM loaded
servers). (me)
oom-2.2.12-I.gz -> assorted OOM fixes (deadlocks in
pagein, Alpha SIGBUS fix, avoid
sigkilling iopl() application send
a sigterm instead, avoid init
to be killed), it's the same
patch merged by Alan into 2.2.14pre2. (me)
pagecache-hash.gz -> pagecache hash dynamic (I think
it's DaveM's work, literally I took it
from 2.2.13ac1). I agree with the
heuristc used. It allocates
num_physpages buckets for the pagecache
and this basically means all the
buckets will be filled supposing a
perfect hash distribution with all the memory
allocated in the cache. (all credits
to David S. Miller)
probe-irq-2.3.14-pre2-1.gz -> avoid a pending irq to be mistaken
for a spurious irq. (me)
shrink_all_cache-2.2.10-A.gz -> make sure that big memory boxes will
shrink the cache well enough. (me)
trashing-mem-2.2.10-A.gz -> heuristic to penalize memory hogs,
the system will remains responsive
also during heavy swapout. (me)
version.gz -> set the EXTRAVERSION to aa2 ;)
wait-event-smp-races.gz -> Put the two mb() after setting the
task state as blocking and before
checking if the event is just happend
(SMP race fix). (me)
wait4-smp-race.gz -> _Critical_ SMP race fix.
Without this one liner each time you
run `ls` from bash, the bash is going
to deadlock in wait4 if you are unlucky
enough. The race is very small
but there are machine under heavy
fork load load that reproduced this
race regularly after some day of load.
The SMP race can happen only
with an SMP kernel on a SMP hardware. (me)
wakeup_bdflush-2.2.10-A.gz -> avoid deadlocking in wakeup_bdflush
(the run_task_queue() can sleep for
example while running the loop
request function). (me)
z-bigmem-2.2.13aa2-6.gz -> 4GB support on x86. (me and
Gerhard Wichert)
z-bigmem-nodebug.gz -> turn the bigmem code into production
mode.
z-bigmem-rawio-2.2.13aa2-1.gz -> rawio working even with bigmem memory
(I started with rawio from 2.2.13ac1
and SCT's 2.3.x rawio bounce buffers,
all the credits go to Stephen C.
Tweedie)
zmagic-all-blocksize.gz -> allow zmagic binaries to run
also on 4k filesystems (it's the same
that gone into 2.2.14pre2). (me)
----------------------------------------------------------------------
To go in sync with 2.2.13aa6 you can:
mkdir 2.2.13aa6
cd 2.2.13aa6
wget --retr-symlinks -A\*.gz ftp://ftp.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.2/2.2.13aa6/\*
cd ..
and now you'll have all the interesting patches in the directory
2.2.13aa6.
At this point rename the 2.2.13 sources to 2.2.13aa6:
mv linux-2.2.13 linux-2.2.13aa6
cd linux-2.2.13aa6
and apply all the 2.2.13aa6 patches that you previously downloaded from
the ftp site:
apply-patches.sh ../2.2.13aa6
At this point your tree will be in sync with 2.2.13aa6. Just configure
recompile and boot the new kernel.
You can find the `apply-patches.sh` bash script I written to easily apply
my kernel patches here:
ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/tools/apply-patches/apply-patches.sh.gz
There is also a README on how to use it:
ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/tools/apply-patches/README.gz
The 2.2.13aa6 kernel is placed here:
ftp://ftp.*.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.2/2.2.13aa6/
Have fun! ;)
Andrea
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