On Tue, 23 Aug 2011, Joe Thornber wrote: > 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? No, it would me much more complicated to export such numbers. > 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). I uploaded new version to http://people.redhat.com/mpatocka/patches/kernel/dm-thinp-bufio/dm-bufio.patch There is file "/sys/module/dm_bufio/parameters/peak_allocated" which contains peak memory consumption. You can reset the value by writing 0 to the file. Mikulas > - Joe > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
