Messages in this thread | | | Date | Fri, 1 Dec 2006 18:00:53 +0800 | From | Aubrey <> | Subject | Re: The VFS cache is not freed when there is not enough free memory to allocate |
| |
On 12/1/06, Nick Piggin <nickpiggin@yahoo.com.au> wrote: > > The pattern you are seeing here is probably due to the page allocator > always retrying process context allocations which are <= order 3 (64K > with 4K pages). > > You might be able to increase this limit a bit for your system, but it > could easily cause problems. Especially fragmentation on nommu systems > where the anonymous memory cannot be paged out.
Thanks for your clue. I found increasing this limit could really help my test cases. When MemFree < 8M, and the test case request 1M * 8 times, the allocation can be sucessful after 81 times rebalance, :). So far I haven't found any issue.
If I make a patch to move this parameter to be tunable in the proc filesystem on nommu case, is it acceptable?
Thanks, -Aubrey - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |