[linux-mm-cc] linux-2.6.36, builtin zram: sys/block/zram0/blocksize kaputt

[clemens fischer]

'uname -rms' -> Linux 2.6.36-spott i686

Hi,

I've been running compcache.googlecode.com/hg since 2.6.34.x. The
latest interface needed only

echo "$disksize" > /sys/block/zram0/disksize &&
mkswap -L zram0 /dev/zram0 && swapon -p 55 /dev/zram0

and I got compressed swap for what little my machine usually had to do
with swapping, keeping thos eblocks off the disk.

Now this interface seems gone from what I read in zram.txt, and the
older zramconfig was resurrected.

Is this going to be permanent or was an older compcache version merged?
If it is permanent, where do I get the userspace from, I mean, what hg
version do I need to check out for them? I noticed zramconfig somewhere
in the repo, but they must be in older revisions, because the current
code doesn't have it.


gruss, clemens fischer
regards, clemens fischer

[Nitin Gupta]

Hi,

On Sun, Oct 31, 2010 at 4:25 PM, clemens fischer <

Post by clemens fischer
'uname -rms' -> Linux 2.6.36-spott i686
I've been running compcache.googlecode.com/hg since 2.6.34.x. The
latest interface needed only
echo "$disksize" > /sys/block/zram0/disksize &&
mkswap -L zram0 /dev/zram0 && swapon -p 55 /dev/zram0
and I got compressed swap for what little my machine usually had to do
with swapping, keeping thos eblocks off the disk.
Now this interface seems gone from what I read in zram.txt, and the
older zramconfig was resurrected.
Is this going to be permanent or was an older compcache version merged?
If it is permanent, where do I get the userspace from, I mean, what hg
version do I need to check out for them? I noticed zramconfig somewhere
in the repo, but they must be in older revisions, because the current
code doesn't have it.

I guess you are trying to use the mainline version of zram -- zramconfig is
now gone as we want to switch to /sys interface instead. Currently, mainline
version is in a bit inconsistent state and some important fixes have not yet
reached mainline due to time constraints. I hope to fix that in near future.
In the mean time, please use zram code from project hg repository.

Thanks,
Nitin
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[clemens fischer]

Post by Nitin Gupta
I guess you are trying to use the mainline version of zram -- zramconfig is
now gone as we want to switch to /sys interface instead. Currently, mainline
version is in a bit inconsistent state and some important fixes have not yet
reached mainline due to time constraints. I hope to fix that in near future.
In the mean time, please use zram code from project hg repository.

I already tried that, but it doesn't build with 2.6.36:

/src/bulk/linux/filesystems/compcache/compcache-dev
0 4 # make
make -C "/lib/modules/2.6.36-spott/build" M=/src/bulk/linux/filesystems/compcache/compcache-dev modules
make[1]: Entering directory `/mnt/backup/no-backup/usr/src/linux-2.6.36.y.git'
CC [M] /src/bulk/linux/filesystems/compcache/compcache-dev/zram_drv.o
.../compcache-dev/zram_drv.c: In function zram_make_request:
.../compcache-dev/zram_drv.c:461:2: error: implicit declaration of function bio_rw_flagged
.../compcache-dev/zram_drv.c:461:6: error: BIO_RW_DISCARD undeclared (first use in this function)


regards, clemens