Messages in this thread |  | | Date | Sun, 31 Dec 2000 11:51:50 -0500 (EST) | From | Alexander Viro <> | Subject | Re: [RFC] Generic deferred file writing |
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On Sun, 31 Dec 2000, Linus Torvalds wrote:
> The other thing is that one of the common cases for writing is consecutive > writing to the end of the file. Now, you figure it out: if get_block() > really is a bottle-neck, why not cache the last tree lookup? You'd get a > 99% hitrate for that common case.
Because it is not a bottleneck. The _real_ bottleneck is in ext2_new_block(). Try to profile it and you'll see.
We could diddle with ext2_get_block(). No arguments. But the real source of PITA is balloc.c, not inode.c. Look at the group descriptor cache code and weep. That, and bitmaps handling.
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