path: root/init/Kconfig
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authorRusty Russell <rusty@rustcorp.com.au>2008-07-22 19:24:28 -0500
committerRusty Russell <rusty@rustcorp.com.au>2008-07-22 19:24:28 +1000
commit3a642e99babe0617febb6f402e1e063479f489db (patch)
tree09f7d6c7b0a4e3869d11c739113e5dd5a8ff5a2c /init/Kconfig
parentmodule: turn longs into ints for module sizes (diff)
modules: Take a shortcut for checking if an address is in a module
This patch keeps track of the boundaries of module allocation, in order to speed up module_text_address(). Inspired by Arjan's version, which required arch-specific defines: Various pieces of the kernel (lockdep, latencytop, etc) tend to store backtraces, sometimes at a relatively high frequency. In itself this isn't a big performance deal (after all you're using diagnostics features), but there have been some complaints from people who have over 100 modules loaded that this is a tad too slow. This is due to the new backtracer code which looks at every slot on the stack to see if it's a kernel/module text address, so that's 1024 slots. 1024 times 100 modules... that's a lot of list walking. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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