Messages in this thread | | | Date | Sat, 27 Mar 1999 14:38:11 -0500 (EST) | From | Chuck Lever <> | Subject | Re: buffer cache behavior on memory-constrained systems (fwd) |
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On Sat, 27 Mar 1999, Andrea Arcangeli wrote: > Note that you should also revert to freeing at least the freelist (this is > the reason Linus posted the patch against 2.2.4) and all other lru-list if > the BUF_CLEAN is empty. > > But more important you could have the first entry in the lru list not > freeable (don't ask me why ;), and in such case you would have big > stability problems.
in which case you'd probably see some "out of memory" errors.
> Note that in ftp://e-mind.com/pub/linux/andrea-tree/2.2.4_andrea3.bz2 I am > just freeing pages in shrink_mmap() in perfect lru basis (taking care also > of buffer aging). But I am doing it at the pagemap level. I see it far > more clean and general. I am touching the buffer not in bread but in > get_hash_table and in getblk if the buffer is not found in the hash table.
nice work, andrea...
i've only tried this patch for a short time, but it seems to exhibit lots of desirable characteristics when memory becomes constrained. i'll take a closer look at it as soon as i have time.
- Chuck Lever -- corporate: <chuckl@netscape.com> personal: <chucklever@netscape.net> or <cel@monkey.org>
The Linux Scalability project: http://www.citi.umich.edu/projects/citi-netscape/
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