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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8a81252b77
Mateusz Guzik reported : Currently obtaining a new file descriptor results in locking fdtable twice - once in order to reserve a slot and second time to fill it. Holding the spinlock in __fd_install() is needed in case a resize is done, or to prevent a resize. Mateusz provided an RFC patch and a micro benchmark : http://people.redhat.com/~mguzik/pipebench.c A resize is an unlikely operation in a process lifetime, as table size is at least doubled at every resize. We can use RCU instead of the spinlock. __fd_install() must wait if a resize is in progress. The resize must block new __fd_install() callers from starting, and wait that ongoing install are finished (synchronize_sched()) resize should be attempted by a single thread to not waste resources. rcu_sched variant is used, as __fd_install() and expand_fdtable() run from process context. It gives us a ~30% speedup using pipebench on a dual Intel(R) Xeon(R) CPU E5-2696 v2 @ 2.50GHz Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Mateusz Guzik <mguzik@redhat.com> Acked-by: Mateusz Guzik <mguzik@redhat.com> Tested-by: Mateusz Guzik <mguzik@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> |
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| adfs.txt | ||
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| directory-locking | ||
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| dnotify_test.c | ||
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| isofs.txt | ||
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| Locking | ||
| locks.txt | ||
| logfs.txt | ||
| Makefile | ||
| mandatory-locking.txt | ||
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| ntfs.txt | ||
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| porting | ||
| proc.txt | ||
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| xfs-delayed-logging-design.txt | ||
| xfs-self-describing-metadata.txt | ||
| xfs.txt | ||