== sanity test 834: mmap readahead for madvise with MADV_HUGEPAGE ========================================================== 20:07:42 (1768266462)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 14.0939 s, 7.4 MB/s
llite.lustre-ffff99fe858d1000.read_ahead_stats=clear
llite.lustre-ffff99fe858d1000.read_ahead_stats=
snapshot_time             1768266505.230918614 secs.nsecs
start_time                1768266482.886046356 secs.nsecs
elapsed_time              22.344872258 secs.nsecs
hits                      25370 samples [pages]
misses                    230 samples [pages]
zero_size_window          56 samples [pages]
failed_to_reach_end       2 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=224593: Mon Jan 12 20:19:45 2026
  read: IOPS=7, BW=7798KiB/s (7986kB/s)(5120MiB/672304msec)
    clat (msec): min=46, max=450, avg=130.47, stdev=52.59
     lat (msec): min=46, max=450, avg=130.47, stdev=52.59
    clat percentiles (msec):
     |  1.00th=[   58],  5.00th=[   65], 10.00th=[   71], 20.00th=[   84],
     | 30.00th=[   96], 40.00th=[  109], 50.00th=[  122], 60.00th=[  136],
     | 70.00th=[  153], 80.00th=[  171], 90.00th=[  199], 95.00th=[  226],
     | 99.00th=[  296], 99.50th=[  326], 99.90th=[  363], 99.95th=[  384],
     | 99.99th=[  451]
   bw (  KiB/s): min= 1973, max=18432, per=100.00%, avg=7860.29, stdev=3000.78, samples=1326
   iops        : min=    1, max=   18, avg= 7.03, stdev= 3.05, samples=1326
  lat (msec)   : 50=0.14%, 100=33.24%, 250=63.81%, 500=2.81%
  cpu          : usr=0.45%, sys=36.12%, ctx=24298, majf=6751, minf=1304238
  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=7798KiB/s (7986kB/s), 7798KiB/s-7798KiB/s (7986kB/s-7986kB/s), io=5120MiB (5369MB), run=672304-672304msec