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On 11/29/06, Sonic Zhang <sonic.adi@gmail.com> wrote: > Forward to the mailing list. > > > On 11/27/06, Nick Piggin <nickpiggin@yahoo.com.au> wrote: > > > >> I haven't actually written any nommu userspace code, but it is obvious > >> that you must try to keep malloc to <= PAGE_SIZE (although order 2 and > >> even 3 allocations seem to be reasonable, from process context)... Then > >> you would use something a bit more advanced than a linear array to store > >> data (a pagetable-like radix tree would be a nice, easy idea). > >> > > > > But, even we split the 8M memory into 2048 x 4k blocks, we still face > > this failure. The key problem is that available memory is small than > > 2048 x 4k, while there are still a lot of VFS cache. The VFS cache can > > be freed, but kernel allocation function ignores it. See the new test > > application. > > > Which kernel allocation function? If you can provide more details I'd > like to get to the bottom of this. I posted it here, I think you missed it. So forwarded it to you. > > Because the anonymous memory allocation in mm/nommu.c is all allocated > with GFP_KERNEL from process context, and in that case, the allocator > should not fail but call into page reclaim which in turn will free VFS > caches. > > > > > What's a better way to free the VFS cache in memory allocator? > > > It should be freeing it for you, so I'm not quite sure what is going > on. Can you send over the kernel messages you see when the allocation > fails? I don't think so. The kernel doesn't attempt to free it. The log is included in the mail I forwarded to you. > > Also, do you happen to know of a reasonable toolchain + emulator setup > that I could test the nommu kernel with? A project named skyeye. http://www.skyeye.org/index.shtml -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/ | ||||||||||||
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