Ravikiran G Thirumalai a écrit :
Change the atomic_t sockets_allocated member of struct proto to a
per-cpu counter.
Signed-off-by: Pravin B. Shelar <[email protected]>
Signed-off-by: Ravikiran Thirumalai <[email protected]>
Signed-off-by: Shai Fultheim <[email protected]>
Hi Ravikiran
If I correctly read this patch, I think there is a scalability problem.
On a big SMP machine, read_sockets_allocated() is going to be a real killer.
Say we have 128 Opterons CPUS in a box.
You'll need to bring 128 cache lines (plus 8*128 bytes to read the 128
pointers inside percpu structure)
I think a solution 'a la percpu_counter' is preferable, or even better a
dedicated per_cpu with a threshold management (see mm/swap.c , function
vm_acct_memory() to see how vm_committed_space is updated without too bad SMP
scalability)
Thank you
Eric
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