Messages in this thread | | | From | Markus <> | Subject | Re: drop_caches ... | Date | Wed, 4 Mar 2009 19:47:41 +0100 |
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Am Mittwoch, 4. März 2009 schrieb Zdenek Kabelac: > 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 > >>>> > >>>> 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 ?
I rebooted in console without the nvidia-module loaded and have the same results (updated to 2.6.28.7 btw): # sync ; echo 3 > /proc/sys/vm/drop_caches ; free -m ; cat /proc/meminfo total used free shared buffers cached Mem: 3950 1647 2303 0 0 924 -/+ buffers/cache: 722 3228 Swap: 5890 0 5890 MemTotal: 4045444 kB MemFree: 2358944 kB Buffers: 544 kB Cached: 946624 kB SwapCached: 0 kB Active: 1614756 kB Inactive: 7632 kB Active(anon): 1602476 kB Inactive(anon): 0 kB Active(file): 12280 kB Inactive(file): 7632 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 6032344 kB SwapFree: 6032344 kB Dirty: 72 kB Writeback: 32 kB AnonPages: 675224 kB Mapped: 17756 kB Slab: 19936 kB SReclaimable: 9652 kB SUnreclaim: 10284 kB PageTables: 8296 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 8055064 kB Committed_AS: 3648088 kB VmallocTotal: 34359738367 kB VmallocUsed: 10616 kB VmallocChunk: 34359716459 kB DirectMap4k: 6080 kB DirectMap2M: 4188160 kB
Thanks! Markus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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