On Fri 25-10-19 15:45:37, Robert Stupp wrote: > On Fri, 2019-10-25 at 15:27 +0200, Michal Hocko wrote: > > On Fri 25-10-19 15:10:39, Robert Stupp wrote: > > [...] > > > cat /proc/$(pidof test)/smaps > > > > Nothing really unusual that would jump at me except for > > > 7f8be90ed000-7f8be9265000 r-xp 00025000 103:02 > > > 44307431 /lib/x86_64-linux-gnu/libc-2.30.so > > > Size: 1504 kB > > > KernelPageSize: 4 kB > > > MMUPageSize: 4 kB > > > Rss: 832 kB > > > Pss: 5 kB > > > Shared_Clean: 832 kB > > > Shared_Dirty: 0 kB > > > Private_Clean: 0 kB > > > Private_Dirty: 0 kB > > > Referenced: 832 kB > > > Anonymous: 0 kB > > > LazyFree: 0 kB > > > AnonHugePages: 0 kB > > > ShmemPmdMapped: 0 kB > > > Shared_Hugetlb: 0 kB > > > Private_Hugetlb: 0 kB > > > Swap: 0 kB > > > SwapPss: 0 kB > > > Locked: 5 kB > > > > Huh, 5kB, is this really the case or some copy&paste error? > > How can we end up with !pagesize multiple here? Ohh, I haven't noticed pss and didn't realize that Locked is pss like as well. > > > > > THPeligible: 0 > > > VmFlags: rd ex mr mw me lo sd > > mlockall() seems to lock everything though, it just never returns. > > Pretty sure that it's not a copy&paste error. Got a couple more runs > that have an "odd size" - this time with 3kB... > All "Locked" values seem to be okay - except that one. And it's always > odd for the same one (the one with `Size: 1504 kB`). > It's not always odd (3 kB or 5 kB) though - sometimes it says 4 kB. > Seems it's a little breadcrumb? Please try to watch for stack of the syscall and see if there is any pattern. -- Michal Hocko SUSE Labs
