From 77c066ea5cf4b1ee606a81e48388ff0b1d019134 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 25 Oct 2009 04:35:22 +0100 Subject: modutils: add FEATURE_INSMOD_TRY_MMAP option function old new delta try_to_mmap_module - 121 +121 bb_init_module_24 4514 4578 +64 bb_init_module 119 173 +54 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/0 up/down: 239/0) Total: 239 bytes Signed-off-by: Denys Vlasenko --- modutils/Config.in | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'modutils/Config.in') diff --git a/modutils/Config.in b/modutils/Config.in index d2a2e04..83c12b6 100644 --- a/modutils/Config.in +++ b/modutils/Config.in @@ -121,6 +121,22 @@ config FEATURE_2_4_MODULES This increases size considerably. Say N unless you plan to run ancient kernels. +config FEATURE_INSMOD_TRY_MMAP + bool "Try to load module from a mmap'ed area" + default n + depends on INSMOD || MODPROBE_SMALL + help + This option causes module loading code to try to mmap + module first. If it does not work (for example, + it does not work for compressed modules), module will be read + (and unpacked if needed) into a memory block allocated by malloc. + + The only case when mmap works but malloc does not is when + you are trying to load a big module on a very memory-constrained + machine. Malloc will momentarily need 2x as much memory as mmap. + + Choosing N saves about 250 bytes of code (on 32-bit x86). + config FEATURE_INSMOD_VERSION_CHECKING bool "Enable module version checking" default n -- cgit v1.1