On Sat, 3 Nov 2007, Rik van Riel wrote:
> Define page_file_cache() function to answer the question:
> is page backed by a file?
Well its not clear what is meant by a file in the first place.
By file you mean disk space in contrast to ram based filesystems?
I think we could add a flag to the bdi to indicate wheter the backing
store is a disk file. In fact you can also deduce if if a device has
no writeback capability set in the BDI.
> Unfortunately this needs to use a page flag, since the
> PG_swapbacked state needs to be preserved all the way
> to the point where the page is last removed from the
> LRU. Trying to derive the status from other info in
> the page resulted in wrong VM statistics in earlier
> split VM patchsets.
The bdi may avoid that extra flag.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
