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SubjectRe: [RFC] BH removal text
On Sun, Jul 14, 2002 at 10:22:19AM +0530, Dipankar Sarma wrote:
>> Even if you replace timemr_bh() with a tasklet, you still need
>> to take the global_bh_lock to ensure that timers don't race with
>> single-threaded BH processing in drivers. I wrote this patch [included]
>> to get rid of timer_bh in Ingo's smptimers, but it acquires
>> global_bh_lock as well as net_bh_lock, the latter to ensure
>> that some older protocol code that expected serialization of
>> NET_BH and timers work correctly (see deliver_to_old_ones()).
>> They need to be cleaned up too.
>> My patch of course was experimental to see what is needed to
>> get rid of timer_bh. It needs some cleanup itself ;-)

On Thu, Jul 18, 2002 at 01:22:38AM -0700, William Lee Irwin III wrote:
> I'll follow up with the "before" profile next.

By the way, since it applies with just offsets to 2.5.26 I did my testing
on it. Here they are:

c01210c3 15914360 73.4974 .text.lock.timer
c0120114 1740662 8.03891 mod_timer
c0196480 533190 2.46243 csum_partial_copy_generic
c0196650 409733 1.89227 __generic_copy_to_user
c0112658 271923 1.25582 try_to_wake_up
c022893c 227856 1.05231 tcp_v4_rcv
c021ba91 219423 1.01336 .text.lock.tcp
c0107bb4 216722 1.00089 apic_timer_interrupt
c02118a4 160277 0.740208 ip_output
c011330c 123467 0.570208 schedule
c021727c 121239 0.559919 tcp_sendmsg
c0200170 121187 0.559679 dev_queue_xmit
c02021ad 83061 0.383601 .text.lock.dev
c02119f4 80365 0.37115 ip_queue_xmit
c0112f74 77876 0.359655 scheduler_tick
c01fcd98 75855 0.350322 __kfree_skb
c010fb30 73084 0.337524 smp_apic_timer_interrupt
c0218688 68854 0.317989 tcp_data_wait
c0218af4 66201 0.305736 tcp_recvmsg
c01207f8 64625 0.298458 timer_bh
c021e448 55844 0.257905 tcp_ack
c010cd60 52670 0.243246 do_gettimeofday
c02207b4 51631 0.238448 tcp_rcv_established

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