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poll-optim-jiffies : Optimize the timeout computation for poll() and epoll()
The poll and epoll mechanisms use a millisecond-based timeout which gets
converted to jiffies. However, the conversion is suboptimal in that it
contains one multiply and one divide. The patch makes use of msec_to_jiffies()
to let the compiler eliminate those operations when HZ divides 1000.
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| Initial date: | 2005/12/04 |
| Description: | Optimize the timeout computation for poll() and epoll() |
| Author(s): | Willy Tarreau |
| See also: | epoll-lt |
| Abstract: | The poll and epoll mechanisms use a millisecond-based timeout which gets
converted to jiffies. However, the conversion is suboptimal in that it
contains one multiply and one divide. The patch makes use of msec_to_jiffies()
to let the compiler eliminate those operations when HZ divides 1000.
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Notes
The epoll patch only applies to epoll-enabled kernels.
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(C) Willy Tarreau - 2008-06-01