Subj : [$] Extending time slices for user-space locks
To   : All
From : LWN.net
Date : Mon Feb 24 2025 09:45:10

[$] Extending time slices for user-space locks

Date:
Wed, 19 Feb 2025 20:17:25 +0000

Description:
Steven Rostedt recently posted a patch set that could help improve the 
performance of certain user-space
applications by giving the scheduler more context about when they are safe to
interrupt. The patch set lets programs request a small grace window
before they can be interrupted so that they can relinquish any locks, 
decreasing the
amount of time that other threads have to spend waiting. Rostedt shared
performance numbers suggesting that the patch might cut the amount of time 
spent
acquiring locks in half for some programs  although, since his test was
specifically tuned for this case, real-world projects should expect a somewhat
less dramatic improvement. The change received some pushback from scheduler
maintainer Peter Zijlstra, who objected to the patch set's approach.

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Link to news story:
https://lwn.net/Articles/1009509/


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