On 4/20/07, David Howells <[email protected]> wrote:
Aubrey Li <[email protected]> wrote:
> as checked in packet_set_ring, buffer size must be a multiple of PAGE_SIZE,
> --------------------packet_set_ring------------------------
> if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
>
> So why not use __get_free_pages rather than kmalloc,
Because kmalloc() may be able to get us a smaller chunk of memory. Actually,
calling __get_free_pages() might be a better, and then release the excess
pages.
so that we have pagetables to count?
There are no pagetables in NOMMU-mode.
Hmm..., I'm thinking some codes in memory reclaim depend on
NR_FILE_MMAPED like follows
----snip----
if (zone_page_state(zone, NR_FILE_PAGES) -
zone_page_state(zone, NR_FILE_MAPPED) >
zone->min_unmapped_pages)
----snip----
Since we are enabling packet mmap feature, we should take its mapped
pages into count of NR_FILE_MAPPED.
-Aubrey
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