Can you please fix your email client? The broken quoting is just irritating. On Tue 19-03-19 11:45:03, Pankaj Suryawanshi wrote: [...] > I have tried for latency count for 385MB: > > reclaim- reclaim_clean_pages_from_list() > migrate- migrate_pages() > migrateranges- isolate_migratepages_range() > overall - __alloc_contig_migrate_range() > > Note: output is in us > > [ 1151.420923] LATENCY reclaim= 43 migrate=128 migrateranges=23 > [ 1151.421209] LATENCY reclaim= 11 migrate=253 migrateranges=14 > [ 1151.427856] LATENCY reclaim= 45 migrate=12 migrateranges=12 > [ 1151.434485] LATENCY reclaim= 44 migrate=33 migrateranges=12 > [ 1151.440975] LATENCY reclaim= 45 migrate=0 migrateranges=11 > [ 1151.447513] LATENCY reclaim= 39 migrate=35 migrateranges=11 > [ 1151.453919] LATENCY reclaim= 46 migrate=0 migrateranges=12 > [ 1151.460474] LATENCY reclaim= 39 migrate=41 migrateranges=11 > [ 1151.466947] LATENCY reclaim= 54 migrate=32 migrateranges=17 > [ 1151.473464] LATENCY reclaim= 45 migrate=21 migrateranges=12 > [ 1151.480016] LATENCY reclaim= 41 migrate=39 migrateranges=12 > [ 1151.486551] LATENCY reclaim= 41 migrate=36 migrateranges=12 > [ 1151.493199] LATENCY reclaim= 13 migrate=188 migrateranges=12 > [ 1151.500034] LATENCY reclaim= 60 migrate=94 migrateranges=13 > [ 1151.506686] LATENCY reclaim= 78 migrate=9 migrateranges=12 > [ 1151.513313] LATENCY reclaim= 33 migrate=147 migrateranges=12 > [ 1151.519839] LATENCY reclaim= 52 migrate=98 migrateranges=12 > [ 1151.526556] LATENCY reclaim= 46 migrate=126 migrateranges=12 > [ 1151.533254] LATENCY reclaim= 22 migrate=230 migrateranges=12 > [ 1151.540145] LATENCY reclaim= 0 migrate=305 migrateranges=13 > [ 1151.546997] LATENCY reclaim= 1 migrate=301 migrateranges=13 > [ 1151.553686] LATENCY reclaim= 40 migrate=201 migrateranges=12 > [ 1151.560395] LATENCY reclaim= 35 migrate=149 migrateranges=12 > [ 1151.567076] LATENCY reclaim= 77 migrate=43 migrateranges=16 > [ 1151.573836] LATENCY reclaim= 34 migrate=190 migrateranges=12 > [ 1151.580510] LATENCY reclaim= 51 migrate=120 migrateranges=12 > [ 1151.587240] LATENCY reclaim= 33 migrate=147 migrateranges=13 > [ 1151.594036] LATENCY reclaim= 20 migrate=241 migrateranges=13 > [ 1151.600749] LATENCY reclaim= 75 migrate=41 migrateranges=13 > [ 1151.607402] LATENCY reclaim= 77 migrate=32 migrateranges=12 > [ 1151.613956] LATENCY reclaim= 72 migrate=35 migrateranges=12 > [ 1151.620642] LATENCY reclaim= 59 migrate=162 migrateranges=12 > [ 1151.627181] LATENCY reclaim= 76 migrate=9 migrateranges=11 > [ 1151.633795] LATENCY reclaim= 80 migrate=0 migrateranges=12 > [ 1151.640278] LATENCY reclaim= 87 migrate=18 migrateranges=12 > [ 1151.646758] LATENCY reclaim= 82 migrate=10 migrateranges=11 > [ 1151.653307] LATENCY reclaim= 71 migrate=31 migrateranges=12 > [ 1151.659911] LATENCY reclaim= 61 migrate=77 migrateranges=12 > [ 1151.666514] LATENCY reclaim= 94 migrate=42 migrateranges=15 > [ 1151.673089] LATENCY reclaim= 67 migrate=59 migrateranges=12 > [ 1151.679655] LATENCY reclaim= 81 migrate=14 migrateranges=12 > [ 1151.686253] LATENCY reclaim= 49 migrate=93 migrateranges=12 > [ 1151.692815] LATENCY reclaim= 61 migrate=54 migrateranges=12 > [ 1151.699438] LATENCY reclaim= 42 migrate=99 migrateranges=10 > [ 1151.705881] OVERALL overall=285157 cumulative numbers are reclaim:2222 migrate:3995 migrateranges:552 sum:6217 So those code paths you were measuring were contributing to the overal latency only marginally (~2%). > cma_alloc latency is = 297385 us As I've said earlier I would just use perf with the call graph support and look at the time distribution to see where the bottleneck is. -- Michal Hocko SUSE Labs
