== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 18:07:24 (1768259244)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 11.5902 s, 9.0 MB/s
llite.lustre-ffffa023091c7800.read_ahead_stats=clear
llite.lustre-ffffa023091c7800.read_ahead_stats=
snapshot_time             1768259283.441728875 secs.nsecs
start_time                1768259261.785313889 secs.nsecs
elapsed_time              21.656414986 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          37 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=225439: Mon Jan 12 18:22:18 2026
  read: IOPS=6, BW=6198KiB/s (6346kB/s)(5120MiB/845943msec)
    clat (msec): min=34, max=444, avg=164.57, stdev=49.82
     lat (msec): min=34, max=444, avg=164.57, stdev=49.82
    clat percentiles (msec):
     |  1.00th=[   71],  5.00th=[   96], 10.00th=[  108], 20.00th=[  123],
     | 30.00th=[  136], 40.00th=[  148], 50.00th=[  159], 60.00th=[  171],
     | 70.00th=[  186], 80.00th=[  203], 90.00th=[  230], 95.00th=[  255],
     | 99.00th=[  305], 99.50th=[  326], 99.90th=[  397], 99.95th=[  443],
     | 99.99th=[  443]
   bw (  KiB/s): min= 1805, max=14336, per=100.00%, avg=6228.33, stdev=1739.66, samples=1669
   iops        : min=    1, max=   14, avg= 5.36, stdev= 1.78, samples=1669
  lat (msec)   : 50=0.16%, 100=6.41%, 250=87.79%, 500=5.64%
  cpu          : usr=0.32%, sys=25.19%, ctx=30355, majf=6588, minf=1304401
  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=6198KiB/s (6346kB/s), 6198KiB/s-6198KiB/s (6346kB/s-6346kB/s), io=5120MiB (5369MB), run=845943-845943msec