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    SubjectRe: drop_caches ...
    Markus napsal(a):
    >>>>>>> The memory mapped pages won't be dropped in this way.
    >>>>>>> "cat /proc/meminfo" will show you the number of mapped pages.
    >>>>>> # sync ; echo 3 > /proc/sys/vm/drop_caches ; free -m ;
    >>>> cat /proc/meminfo
    >>>>>> total used free shared buffers
    >>>>>> cached
    >>>>>> Mem: 3950 3262 688 0 0
    >>>>>> 359
    >>>>>> -/+ buffers/cache: 2902 1047
    >>>>>> Swap: 5890 1509 4381
    >>>>>> MemTotal: 4045500 kB
    >>>>>> MemFree: 705180 kB
    >>>>>> Buffers: 508 kB
    >>>>>> Cached: 367748 kB
    >>>>>> SwapCached: 880744 kB
    >>>>>> Active: 1555032 kB
    >>>>>> Inactive: 1634868 kB
    >>>>>> Active(anon): 1527100 kB
    >>>>>> Inactive(anon): 1607328 kB
    >>>>>> Active(file): 27932 kB
    >>>>>> Inactive(file): 27540 kB
    >>>>>> Unevictable: 816 kB
    >>>>>> Mlocked: 0 kB
    >>>>>> SwapTotal: 6032344 kB
    >>>>>> SwapFree: 4486496 kB
    >>>>>> Dirty: 0 kB
    >>>>>> Writeback: 0 kB
    >>>>>> AnonPages: 2378112 kB
    >>>>>> Mapped: 52196 kB
    >>>>>> Slab: 65640 kB
    >>>>>> SReclaimable: 46192 kB
    >>>>>> SUnreclaim: 19448 kB
    >>>>>> PageTables: 28200 kB
    >>>>>> NFS_Unstable: 0 kB
    >>>>>> Bounce: 0 kB
    >>>>>> WritebackTmp: 0 kB
    >>>>>> CommitLimit: 8055092 kB
    >>>>>> Committed_AS: 4915636 kB
    >>>>>> VmallocTotal: 34359738367 kB
    >>>>>> VmallocUsed: 44580 kB
    >>>>>> VmallocChunk: 34359677239 kB
    >>>>>> DirectMap4k: 3182528 kB
    >>>>>> DirectMap2M: 1011712 kB
    >>>>>>
    >>>>>> The cached reduced to 359 MB (after the dropping).
    >>>>>> I dont know where to read the "number of mapped pages".
    >>>>>> "Mapped" is about 51 MB.
    >>>>> Does your tmpfs store lots of files?
    >>>> Dont think so:
    >>>>
    >>>> # df -h
    >>>> Filesystem Size Used Avail Use% Mounted on
    >>>> /dev/md6 14G 8.2G 5.6G 60% /
    >>>> udev 10M 304K 9.8M 3% /dev
    >>>> cachedir 4.0M 100K 4.0M 3% /lib64/splash/cache
    >>>> /dev/md4 19G 15G 3.1G 83% /home
    >>>> /dev/md3 8.3G 4.5G 3.9G 55% /usr/portage
    >>>> shm 2.0G 0 2.0G 0% /dev/shm
    >>>> /dev/md1 99M 19M 76M 20% /boot
    >>>>
    >>>> # mount
    >>>> /dev/md6 on / type ext3 (rw,noatime,nodiratime,barrier=0)
    >>>> /proc on /proc type proc (rw,noexec,nosuid,noatime,nodiratime)
    >>>> sysfs on /sys type sysfs (rw,nosuid,nodev,noexec)
    >>>> udev on /dev type tmpfs (rw,nosuid,size=10240k,mode=755)
    >>>> devpts on /dev/pts type devpts (rw,nosuid,noexec,gid=5,mode=620)
    >>>> cachedir on /lib64/splash/cache type tmpfs (rw,size=4096k,mode=644)
    >>>> /dev/md4 on /home type ext3 (rw,noatime,nodiratime,barrier=0)
    >>>> /dev/md3 on /usr/portage type ext4
    > (rw,noatime,nodiratime,barrier=0)
    >>>> shm on /dev/shm type tmpfs (rw,noexec,nosuid,nodev)
    >>>> usbfs on /proc/bus/usb type usbfs
    >>>> (rw,noexec,nosuid,devmode=0664,devgid=85)
    >>>> automount(pid6507) on /mnt/.autofs/misc type autofs
    >>>> (rw,fd=4,pgrp=6507,minproto=2,maxproto=4)
    >>>> automount(pid6521) on /mnt/.autofs/usb type autofs
    >>>> (rw,fd=4,pgrp=6521,minproto=2,maxproto=4)
    >>>> /dev/md1 on /boot type ext2 (rw,noatime,nodiratime)
    >>>>
    >>>> I dont know what exactly all that memory is used for. It varies
    > from
    >>>> about 300 MB to up to one GB.
    >>>> Tell me where to look and I will!
    >>> So you don't have lots of mapped pages(Mapped=51M) or tmpfs files.
    > It's
    >>> strange to me that there are so many undroppable cached
    > pages(Cached=359M),
    >>> and most of them lie out of the LRU queue(Active+Inactive
    > file=53M)...
    >>> Anyone have better clues on these 'hidden' pages?
    >> Maybe try this:
    >>
    >> cat /proc/`pidof X`/smaps | grep drm | wc -l
    >>
    >> you will see some growing numbers.
    >>
    >> Also check cat /proc/dri/0/gem_objects
    >> there should be some number # object bytes - which should be close to
    > your
    >> missing cached pages.
    >>
    >>
    >> If you are using Intel GEM driver - there is some unlimited caching
    > issue
    >> see: http://bugs.freedesktop.org/show_bug.cgi?id=20404
    >>
    > # cat /proc/`pidof X`/smaps | grep drm | wc -l
    > 0
    > # cat /proc/dri/0/gem_objects
    > cat: /proc/dri/0/gem_objects: No such file or directory
    >
    > I use Xorg 1.3 with an nvidia gpu. Dont know if I use a "Intel GEM
    > driver".
    >


    Are you using binary driver from NVidia ??
    Maybe you should ask authors of this binary blob ?

    Could you try to use for a while Vesa driver to see, if you are able to get
    same strange results ?

    Zdenek


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