Hi Stephen,
On 03/20/2016 12:35 PM, Eric Nelson wrote:
On 03/17/2016 02:23 PM, Stephen Warren wrote:
On 03/16/2016 03:40 PM, Eric Nelson wrote:
...
Do you have any stats on how many operations this saves for typical FS operations such as:
- Partition table type identification (with various types such as
MBR/DOS, GPT, ...)
- Partition enumeration
- Filesystem identification (with various filesystems such as FAT, ext,
...)
- File reads
Not yet, but I'm working something up that will allow this to be gathered easily. As soon as we implement a cache, it provides a nice spot for tracing operations.
The V2 RFC patch set implements a command (blkcache) that allows tracing block read operations as they pass through the cache, among other things:
=> blkcache trace => load mmc 0 10008000 /zImage miss: start 0, count 1 fill: start 0, count 1 miss: start 2000, count 1 fill: start 2000, count 1 reading /zImage hit: start 2000, count 1 miss: start 2011, count 2 miss: start 2001, count 6 miss: start 2031, count 9678 miss: start 45ff, count 1 fill: start 45ff, count 1 4955304 bytes read in 258 ms (18.3 MiB/s)
http://lists.denx.de/pipermail/u-boot/2016-March/249155.html https://patchwork.ozlabs.org/patch/599942/