Messages in this thread | | | From | David Howells <> | Subject | Re: [PATCH] v5 RCU: the bloatwatch edition | Date | Tue, 23 Jun 2009 10:12:38 +0100 |
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Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:
> This patch is a version of RCU designed for (!SMP && EMBEDDED) > provided as a proof of concept of a small-footprint RCU implementation. > In particular, the implementation of synchronize_rcu() is extremely > lightweight and high performance. It passes rcutorture testing in each > of the four relevant configurations (combinations of NO_HZ and PREEMPT) > on x86. This saves 1263 bytes compared to Classic RCU, and more than > three kilobytes compared to Hierarchical RCU (updated to 2.6.30):
On FRV:
CONFIG_CLASSIC_RCU=y
text data bss dec hex filename 884 32 20 936 3a8 kernel/rcupdate.o 2616 184 0 2800 af0 kernel/rcuclassic.o
CONFIG_TREE_RCU=y
text data bss dec hex filename 884 32 20 936 3a8 kernel/rcupdate.o 4068 384 0 4452 1164 kernel/rcutree.o
CONFIG_TINY_RCU=y
text data bss dec hex filename 836 32 20 888 378 kernel/rcupdate.o 816 24 0 840 348 kernel/rcutiny.o
On MN10300:
CONFIG_CLASSIC_RCU=y
text data bss dec hex filename 900 28 48 976 3d0 kernel/rcupdate.o 1777 184 0 1961 7a9 kernel/rcuclassic.o
CONFIG_TREE_RCU=y
text data bss dec hex filename 900 28 48 976 3d0 kernel/rcupdate.o 2733 384 0 3117 c2d kernel/rcutree.o
CONFIG_PREEMPT_RCU=y
text data bss dec hex filename 961 28 48 1037 40d kernel/rcupdate.o 3314 128 8 3450 d7a kernel/rcupreempt.o
CONFIG_TINY_RCU=y
text data bss dec hex filename 865 28 48 941 3ad kernel/rcupdate.o 500 24 0 524 20c kernel/rcutiny.o
> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: David Howells <dhowells@redhat.com
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