Make the kconfig option READAHEAD_SMOOTH_AGING depend on
READAHEAD_ALLOW_OVERHEADS, and turned off by default.
Signed-off-by: Wu Fengguang <[email protected]>
---
--- linux-2.6.17-mm2.orig/mm/Kconfig
+++ linux-2.6.17-mm2/mm/Kconfig
@@ -216,6 +216,14 @@ config DEBUG_READAHEAD
Say N for production servers.
config READAHEAD_SMOOTH_AGING
- def_bool n if NUMA
- default y if !NUMA
- depends on ADAPTIVE_READAHEAD
+ bool "Fine grained readahead aging"
+ default n
+ depends on READAHEAD_ALLOW_OVERHEADS && !NUMA
+ help
+ Enable fine grained, mooth accounting of readahead aging.
+
+ It can help servers which meet the following two conditions:
+ - have large number of concurrent readers
+ - have the danger of readahead thrashing(i.e. memory tight)
+
+ This feature is only available on non-NUMA systems.
--
-
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