- 10 7月, 2013 1 次提交
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由 Eliezer Tamir 提交于
Suggested by Linus: Changed time accounting for busy-poll: - Make it microsecond based. - Use unsigned longs. - Revert back to use time_after instead of time_in_range. Reorder poll/select busy loop conditions: - Clear busy_flag after one time we can't busy-poll. - Only init busy_end if we actually are going to busy-poll. Added one more missing need_resched() test. Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 09 7月, 2013 1 次提交
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由 Eliezer Tamir 提交于
Rename functions in include/net/ll_poll.h to busy wait. Clarify documentation about expected power use increase. Rename POLL_LL to POLL_BUSY_LOOP. Add need_resched() testing to poll/select busy loops. Note, that in select and poll can_busy_poll is dynamic and is updated continuously to reflect the existence of supported sockets with valid queue information. Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 03 7月, 2013 2 次提交
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由 Eliezer Tamir 提交于
correct placeholder declarations to prevent build breakage when !CONFIG_NET_LL_RX_POLL Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Eliezer Tamir 提交于
Time in range will fail safely if we move to a different cpu with an extremely large clock skew. Add time_in_range64() and convert lls to use it. changelog: v2 - fixed double call to sched_clock in can_poll_ll - fixed checkpatchisms Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 02 7月, 2013 2 次提交
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由 Eliezer Tamir 提交于
Change Low Latency Sockets code for select and poll so that when LLS is disabled sched_clock() is never called. Also, avoid sending POLL_LL to sockets if disabled. Reported-by: NAndi Kleen <andi@firstfloor.org> Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Eliezer Tamir 提交于
Our use of sched_clock is OK because we don't mind the side effects of calling it and occasionally waking up on a different CPU. When CONFIG_DEBUG_PREEMPT is on, disable preempt before calling sched_clock() so we don't trigger a debug_smp_processor_id() warning. Reported-by: NCody P Schafer <devel-lists@codyps.com> Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 26 6月, 2013 1 次提交
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由 Eliezer Tamir 提交于
select/poll busy-poll support. Split sysctl value into two separate ones, one for read and one for poll. updated Documentation/sysctl/net.txt Add a new poll flag POLL_LL. When this flag is set, sock_poll will call sk_poll_ll if possible. sock_poll sets this flag in its return value to indicate to select/poll when a socket that can busy poll is found. When poll/select have nothing to report, call the low-level sock_poll again until we are out of time or we find something. Once the system call finds something, it stops setting POLL_LL, so it can return the result to the user ASAP. Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 18 6月, 2013 3 次提交
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由 Eliezer Tamir 提交于
adds a socket option for low latency polling. This allows overriding the global sysctl value with a per-socket one. Unexport sysctl_net_ll_poll since for now it's not needed in modules. Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Eliezer Tamir 提交于
Use sched_clock() instead of get_cycles(). We can use sched_clock() because we don't care much about accuracy. Remove the dependency on X86_TSC Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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由 Eliezer Tamir 提交于
There is no reason for sysctl_net_ll_poll to be an unsigned long. Change it into an unsigned int. Fix the proc handler. Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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- 11 6月, 2013 1 次提交
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由 Eliezer Tamir 提交于
Adds an ndo_ll_poll method and the code that supports it. This method can be used by low latency applications to busy-poll Ethernet device queues directly from the socket code. sysctl_net_ll_poll controls how many microseconds to poll. Default is zero (disabled). Individual protocol support will be added by subsequent patches. Signed-off-by: NAlexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: NEliezer Tamir <eliezer.tamir@linux.intel.com> Acked-by: NEric Dumazet <edumazet@google.com> Tested-by: NWillem de Bruijn <willemb@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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