Thank you! I am using perf version 3.13.11.10, will look for newer versions. On Fri, Jan 9, 2015 at 4:06 PM, Joonsoo Kim <js1304@xxxxxxxxx> wrote: > 2015-01-10 1:45 GMT+09:00 Luigi Semenzato <semenzato@xxxxxxxxxx>: >> On Thu, Jan 8, 2015 at 10:30 PM, Andrew Morton >> <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: >>> On Thu, 8 Jan 2015 14:49:45 -0800 Luigi Semenzato <semenzato@xxxxxxxxxx> wrote: >>> >>>> I am taking a closer look at the performance of the Linux MM in the >>>> context of heavy zram usage. The bottom line is that there is >>>> surprisingly high overhead (35-40%) from MM code other than >>>> compression/decompression routines. >>> >>> Those images hurt my eyes. >> >> Sorry about that. I didn't find other ways of computing the >> cumulative cost of functions (i.e. time spent in a function and all >> its descendants, like in gprof). I couldn't get perf to do that >> either. A flat profile shows most functions take a fracion of 1%, so >> it's not useful. If anybody knows a better way I'll be glad to use >> it. > > Hello, > > Recent version of perf has an ability to compute cumulative cost of functions. > And, it's a default configuration. :) > If you change your perf to recent version, you can easily get the data. > > Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>