kernel_optimize_test/net
Trond Myklebust 23918b0306 SUNRPC: Fix a performance regression in the RPC authentication code
Fix a regression reported by Max Kellermann whereby kernel profiling
showed that his clients were spending 45% of their time in
rpcauth_lookup_credcache.

It turns out that although his processes had identical uid/gid/groups,
generic_match() was failing to detect this, because the task->group_info
pointers were not shared. This again lead to the creation of a huge number
of identical credentials at the RPC layer.

The regression is fixed by comparing the contents of task->group_info
if the actual pointers are not identical.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-11-20 13:17:40 -08:00
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9p
802
8021q
appletalk
atm
ax25
bluetooth
bridge
can
core
dccp
decnet
dsa
econet
ethernet
ieee80211
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ipx
irda
iucv
key
lapb
llc
mac80211
netfilter
netlabel
netlink
netrom
packet
phonet
rfkill
rose
rxrpc
sched
sctp
sunrpc
tipc
unix
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socket.c
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