Hi!
> The /proc/filecache support has been half done. And I'd like to hear
> early comments on the interface.
>
> (The patch is not quite ready for code reviews. It is attached in case
> someone are interested to have it a try.)
I guess this is going to be nice for loading cache after
suspend-to-disk and for the fast boot, but...
> SAMPLE OUTPUT
>
> root ~# echo -n ALL > /proc/filecache
> root ~# head /proc/filecache
> # file ALL
> # ino size cached cached% state refcnt uid gid dev file
> 413605 23 24 100 -- 0 0 0 03:00(hda) /sbin/modprobe
> 381701 17 20 100 -- 1 0 0 03:00(hda) /bin/cat
> 398088 1 4 100 -- 0 0 0 03:00(hda) /root/bin/checkpath
> 381698 611 612 100 -- 1 0 0 03:00(hda) /bin/bash
> 159498 1 4 100 -- 0 0 0 03:00(hda) /etc/mtab
> 381719 30 32 100 -- 0 0 0 03:00(hda) /bin/rm
> 335993 4 4 100 -- 0 0 43 03:00(hda) /var/run/utmp
> 0 3687424 828 0 -- 0 0 0 00:02(bdev) 03:00
> 159701 5 8 100 -- 0 0 0 03:00(hda) /etc/modprobe.d/aliases
> 31866 1238 1240 100 -- 4 0 0 03:00(hda) /lib/tls/libc-2.3.5.so
> 381705 51 52 100 -- 0 0 0 03:00(hda) /bin/cp
> 31814 27 28 100 -- 0 0 0 03:00(hda) /lib/libblkid.so.1.0
> 159534 17 20 100 -- 0 0 0 03:00(hda) /etc/ld.so.cache
> [...]
> root ~# echo -n /lib/tls/libc-2.3.5.so > /proc/filecache
> root ~# head /proc/filecache
> # file /lib/tls/libc-2.3.5.so
> # flags LK:locked ER:error RF:referenced UD:uptodate DT:dirty AC:active SL:slab CK:checked A1:arch_1 RS:reserved PV:private WB:writeback NS:nosave CP:compound SC:swapcache MD:mappedtodisk RC:reclaim ns:nosave_free RA:readahead MM:mmap
> # idx len state refcnt location
> 0 21 ____RFUD__AC__________________MD______MM 4 0.0.Normal
> 21 1 ____RFUD__AC__________________MD______MM 3 0.0.Normal
> 22 3 ______UD______________________MD________ 1 0.0.Normal
> 25 1 ____RFUD__AC__________________MD______MM 2 0.0.Normal
> 26 2 ______UD______________________MD________ 1 0.0.Normal
> 28 1 ______UD______________________MD____RA__ 1 0.0.Normal
> 29 2 ______UD______________________MD________ 1 0.0.Normal
The interface is really too ugly to live. How do you expect it being
used from two programs, simultaneously?
We don't really want to do ascii pretty-printing in kernel, sorry. It
probably needs to go into /sys , and be redesigned to provide "one
value per file" rule...
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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