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SubjectRe: [PATCH] v5 RCU: the bloatwatch edition
Date
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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