On (06/13/16 15:49), Ganesh Mahendran wrote: [..] > > some parts (of the info above) are already available: zram<ID> maps to > > pool<ID> name, which maps to a sysfs file name, that can contain the rest. > > I'm just trying to understand what kind of optimizations we are talking > > about here and how would timings help... compaction can spin on class > > lock, for example, if the device in question is busy, etc. etc. on the > > other hand we have a per-class info in zsmalloc pool stats output, so > > why not extend it instead of introducing a new debugging interface? > > I've considered adding new interface in /sys/../zsmalloc/ or uasing > trace_mm_shrink_slab_[start/end] to get such information. > But none of them can cover all the cases: > 1) distinguish which zs pool is compacted. > 2) freed pages of zs_compact(), total freed pages of zs_compact() > 3) realtime log printed I'm not against the patch in general, just curious, do you have any specific optimization in mind? if so, can we start with that optimization then, otherwise, can we define what type of optimizations this tracing will boost? what I'm thinking of, we have a zsmalloc debugfs file, which provides per-device->per-pool->per-class stats: cat /sys/kernel/debug/zsmalloc/zram0/classes class size almost_full almost_empty obj_allocated obj_used pages_used pages_per_zspage freeable so the 'missing' thing is just one column, right? the total freed pages number is already accounted. thoughts? -ss -- 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>