Hi,
This patchset tries to optimize ebpf hash map, and follows
the idea:
Both htab_map_update_elem() and htab_map_delete_elem()
can be called from eBPF program, and they may be in kernel
hot path, it isn't efficient to use a per-hashtable lock
in this two helpers, so this patch converts the lock into
per-bucket spinlock.
With this patchset, looks the performance penalty from eBPF
decreased a lot, see the following test:
1) run 'tools/biolatency' of bcc before running block test;
2) run fio to test block throught over /dev/nullb0,
(randread, 16jobs, libaio, 4k bs) and the test box
is one 24cores(dual sockets) VM server:
- without patchset: 607K IOPS
- with this patchset: 1184K IOPS
- without running eBPF prog: 1492K IOPS
TODO:
- remove the per-hashtable atomic counter
V1:
- fix the wrong 3/3 patch
kernel/bpf/hashtab.c | 60 +++++++++++++++++++++++++++++++---------------------
1 file changed, 36 insertions(+), 24 deletions(-)
Thanks,
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