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libceph: multiple workspaces for CRUSH computations

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Replace a global map->crush_workspace (protected by a global mutex)
with a list of workspaces, up to the number of CPUs + 1.

This is based on a patch from Robin Geuze <robing@nl.team.blue>.
Robin and his team have observed a 10-20% increase in IOPS on all
queue depths and lower CPU usage as well on a high-end all-NVMe
100GbE cluster.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov
2020-08-17 13:45:04 +02:00
parent 1c30c90733
commit 3986f9a42e
3 changed files with 166 additions and 17 deletions
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3
include/linux/crush/crush.h
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@@ -346,6 +346,9 @@ struct crush_work_bucket {
struct crush_work {
struct crush_work_bucket **work; /* Per-bucket working store */
#ifdef __KERNEL__
struct list_head item;
#endif
};
#ifdef __KERNEL__