Andi Kleen wrote:
Nick Piggin <[email protected]> writes:
[haven't read everything, just commenting on something that caught my eye]
+struct fsblock {
+ atomic_t count;
+ union {
+ struct {
+ unsigned long flags; /* XXX: flags could be int for better packing */
int is not supported by many architectures, but works on x86 at least.
Yeah, that would be nice. We could actually use this for buffer_head as well,
but saving 4% there isn't so important as saving 20% for fsblock :)
Hmm, could define a macro DECLARE_ATOMIC_BITMAP(maxbit) that expands to the smallest
possible type for each architecture. And a couple of ugly casts for set_bit et.al.
but those could be also hidden in macros. Should be relatively easy to do.
Cool. It would probably be useful for other things as well.
--
SUSE Labs, Novell Inc.
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