Hi, I was tracing the program flow. So basically i figured out that net_rx_action calls process_backlog and i saw that deletion is happening at net_rx_action().
So i used git blame on that file and saw that this commit performed the deletion. Then when i saw what the commit does, i found that it changed the deletion location from process_backlog to here. Thanks and regards, Vignesh Radhakrishnan On Wed, Dec 24, 2014 at 8:22 AM, lx <[email protected]> wrote: > hi : > How to find this commit: > ################################# > Earlier we had deletion in process_backlog itself, but > https://git.kernel.org/cgit/linux/kernel/git/torvalds/ > linux.git/commit/?id=d75b1ade567ffab085e8adbbdacf0092d10cd09c has changed > it. > ################################# > > There are so many commits, and this commit don't show some messages about > process_backlog().The messages is: > ################################# > commit d75b1ade567ffab085e8adbbdacf0092d10cd09c > Author: Eric Dumazet <[email protected]> > Date: Sun Nov 2 06:19:33 2014 -0800 > > net: less interrupt masking in NAPI > > net_rx_action() can mask irqs a single time to transfert sd->poll_list > into a private list, for a very short duration. > > Then, napi_complete() can avoid masking irqs again, > and net_rx_action() only needs to mask irq again in slow path. > > This patch removes 2 couples of irq mask/unmask per typical NAPI run, > more if multiple napi were triggered. > > Note this also allows to give control back to caller (do_softirq()) > more often, so that other softirq handlers can be called a bit earlier, > or ksoftirqd can be wakeup earlier under pressure. > > This was developed while testing an alternative to RX interrupt > mitigation to reduce latencies while keeping or improving GRO > aggregation on fast NIC. > > Idea is to test napi->gro_list at the end of a napi->poll() and > reschedule one NAPI poll, but after servicing a full round of > softirqs (timers, TX, rcu, ...). This will be allowed only if softirq > is currently serviced by idle task or ksoftirqd, and resched not > needed. > > Signed-off-by: Eric Dumazet <[email protected]> > Cc: Willem de Bruijn <[email protected]> > Signed-off-by: David S. Miller <[email protected]> > ################################# > > > Thank you. > -- http://vigneshradhakrishnan.blogspot.com/
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