[dm-devel] new dm-bufio
Joe Thornber
thornber at redhat.com
Tue Aug 23 11:30:48 UTC 2011
On Mon, Aug 22, 2011 at 04:05:28PM -0400, Mikulas Patocka wrote:
> I uploaded new dm-bufio patch at
> http://people.redhat.com/mpatocka/patches/kernel/dm-thinp-bufio/dm-bufio.patch
>
> It reports the number of allocated bytes in
> "/sys/module/dm_bufio/parameters/". There is a file "total_allocated" that
> contains the number of bytes allocated for buffer cache. There are files
> "allocated_get_free_pages", "allocated_kmalloc", "allocated_vmalloc" that
> contain a number of allocated bytes with each method.
>
> BTW. if you store "1" in "cache_size", it switches to a mode where it
> won't allocate any memory during operation, relying only on preallocated
> reserves --- useful for testing reservation deadlocks.
Great stuff, will merge straight away.
Are these stats broken down by bufio client? ie. can we tell which pool/thinps are consuming all the space?
Would it be possible to record a high watermark as well? This would
be very useful for benchmarking. eg, we'd run a heavy load, then be
able to get the peak memory usage. (Resetting this hwm would also be useful).
- Joe
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