== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 06:57:18 (1768564638)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 10.2399 s, 10.2 MB/s
llite.lustre-ffff909eb42b0800.read_ahead_stats=clear
llite.lustre-ffff909eb42b0800.read_ahead_stats=
snapshot_time             1768564670.244685578 secs.nsecs
start_time                1768564654.021461816 secs.nsecs
elapsed_time              16.223223762 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          55 samples [pages]
failed_to_reach_end       1 samples [pages]
failed_to_fast_read       230 samples [pages]
mmap_range_read           225 samples [pages]
readahead_pages           225 samples [pages] 8 128 25370
/usr/bin/fio
thp                     : Memory Advise Huge Page
read_test: (g=0): rw=read, bs=(R) 1024KiB-1024KiB, (W) 1024KiB-1024KiB, (T) 1024KiB-1024KiB, ioengine=mmap, iodepth=1
fio-3.19
Starting 1 process

read_test: (groupid=0, jobs=1): err= 0: pid=223918: Fri Jan 16 07:08:59 2026
  read: IOPS=7, BW=7934KiB/s (8124kB/s)(5120MiB/660816msec)
    clat (msec): min=24, max=308, avg=128.57, stdev=31.80
     lat (msec): min=24, max=308, avg=128.57, stdev=31.80
    clat percentiles (msec):
     |  1.00th=[   71],  5.00th=[   86], 10.00th=[   93], 20.00th=[  103],
     | 30.00th=[  110], 40.00th=[  117], 50.00th=[  125], 60.00th=[  132],
     | 70.00th=[  142], 80.00th=[  153], 90.00th=[  171], 95.00th=[  188],
     | 99.00th=[  220], 99.50th=[  232], 99.90th=[  262], 99.95th=[  284],
     | 99.99th=[  309]
   bw (  KiB/s): min= 2048, max=14336, per=100.00%, avg=7966.15, stdev=1692.72, samples=1308
   iops        : min=    2, max=   14, avg= 7.14, stdev= 1.75, samples=1308
  lat (msec)   : 50=0.14%, 100=17.19%, 250=82.44%, 500=0.23%
  cpu          : usr=0.43%, sys=35.08%, ctx=25254, majf=6656, minf=1304333
  IO depths    : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0%
     submit    : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     complete  : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0%
     issued rwts: total=5120,0,0,0 short=0,0,0,0 dropped=0,0,0,0
     latency   : target=0, window=0, percentile=100.00%, depth=1

Run status group 0 (all jobs):
   READ: bw=7934KiB/s (8124kB/s), 7934KiB/s-7934KiB/s (8124kB/s-8124kB/s), io=5120MiB (5369MB), run=660816-660816msec