Messages in this thread | | | Date | Tue, 06 Mar 2007 12:23:22 -0600 | From | Eric Sandeen <> | Subject | Re: [RFC] Heads up on sys_fallocate() |
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Jan Kara wrote: > On Tue 06-03-07 06:36:09, Ulrich Drepper wrote: >> Christoph Hellwig wrote: >>> fallocate with the whence argument and flags is already quite complicated, >>> I'd rather have another call for placement decisions, that would >>> be called on an fd to do placement decissions for any further allocations >>> (prealloc, write, etc) >> Yes, posix_fallocate shouldn't be made more complicated. But I don't >> understand why requesting linear layout of the blocks should be an >> option. It's always an advantage if the blocks requested this way are >> linear on disk. So, the kernel should always do its best to make this >> happen, without needing an additional option. > Actually, it's not that simple. You want linear layout of blocks you are > going to read. That is not necessary a linear layout of blocks in a single > file - trace sometime a start of some complicated app like KDE. You find > it's seeking like a hell because it needs a few blocks from a ton of > distinct files (shared libs, config files, etc). As these files are mostly > read only, it's advantageous to interleave them on disk or at least keep > them close.
At some point shouldn't the apps be fixed, rather than do crazy things with the filesystem? :)
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