== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 04:32:39 (1768555959)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 12.5836 s, 8.3 MB/s
llite.lustre-ffff8c7ac9d72800.read_ahead_stats=clear
llite.lustre-ffff8c7ac9d72800.read_ahead_stats=
snapshot_time             1768555999.407948206 secs.nsecs
start_time                1768555978.231691638 secs.nsecs
elapsed_time              21.176256568 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          54 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=226695: Fri Jan 16 04:48:15 2026
  read: IOPS=5, BW=5919KiB/s (6061kB/s)(5120MiB/885719msec)
    clat (msec): min=29, max=464, avg=172.26, stdev=48.82
     lat (msec): min=29, max=464, avg=172.26, stdev=48.82
    clat percentiles (msec):
     |  1.00th=[   82],  5.00th=[  103], 10.00th=[  114], 20.00th=[  131],
     | 30.00th=[  144], 40.00th=[  157], 50.00th=[  167], 60.00th=[  180],
     | 70.00th=[  194], 80.00th=[  211], 90.00th=[  236], 95.00th=[  259],
     | 99.00th=[  309], 99.50th=[  334], 99.90th=[  376], 99.95th=[  409],
     | 99.99th=[  464]
   bw (  KiB/s): min= 1980, max=12288, per=100.00%, avg=5949.61, stdev=1592.90, samples=1748
   iops        : min=    1, max=   12, avg= 5.08, stdev= 1.64, samples=1748
  lat (msec)   : 50=0.06%, 100=3.98%, 250=89.36%, 500=6.60%
  cpu          : usr=0.33%, sys=25.04%, ctx=30845, majf=6896, minf=1304093
  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=5919KiB/s (6061kB/s), 5919KiB/s-5919KiB/s (6061kB/s-6061kB/s), io=5120MiB (5369MB), run=885719-885719msec