January 2006
Intermediate to advanced
226 pages
6h 11m
English
book
Linux for IBM System z9 and IBM zSeries
by Gregory Geiselhart, Robert Brenneman, Eli Dow, Klaus Egeler, Torsten Gutenberger, Bruce Hayden, Livio Sousa
Content preview from Linux for IBM System z9 and IBM zSeries
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14 Linux for IBM System z9 and IBM zSeries
primitive, futexes operate in both user-space, and kernel-space. Futex
operations begin in user-space. If no contention exists for the futex, the operation
completes in user-space. Expensive system calls to kernel-space are required
only if contention exists for the futex.
2.2.5 I/O performance and scalability enhancements
Several improvements have been made to the I/O subsystem. In the Linux 2.6
kernel, there is no global I/O request lock. Instead, each I/O device has its own
I/O request lock. Both the asynchronous I/O and direct I/O layers have been
rewritten:
The asynchronous I/O system allows app ...
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