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issue: 2342345 Optimize wakeup mechanizm #942

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issue: 2342345 Optimize wakeup mechanizm #942

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Commits on Mar 4, 2021

  1. issue: 2342345 Add new wakeup mechanism using eventfd 

    Add class wakeup_eventfd which hold fd created from eventfd()
(represented counter in kernel). This fd using as an event wait/notify
mechanism. Call read() for this fd will increment counter and fd will be
ready to read. Call write() will decrement counter to zero.

Signed-off-by: Yohanan Betsis <[email protected]>
Reviewed-by: Igor Ivanov <[email protected]>
    @adanos911 @igor-ivanov
    adanos911 authored and igor-ivanov committed Mar 4, 2021
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  2. issue: 2342345 Change poll instead of epoll for wait CQ event 

    There issue with big CPU consumption in softirq when we use epoll and
have large number of waiters for CQ fd. This poll() implementation using
wakeup_eventfd() for wakeup mechanism.

Signed-off-by: Yohanan Betsis <[email protected]>
Reviewed-by: Igor Ivanov <[email protected]>
    @adanos911 @igor-ivanov
    adanos911 authored and igor-ivanov committed Mar 4, 2021
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  3. issue: 2342345 Handle concurrent delete from fds poll array 

    Add fds which we want to delete in array and wakeup. After wake up we
handle its event and delete fds from delete fds' array from poll array.

Signed-off-by: Yohanan Betsis <[email protected]>
Reviewed-by: Igor Ivanov <[email protected]>
    @igor-ivanov
    igor-ivanov committed Mar 4, 2021
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