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vm: enable filemap=1 by default

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. turns on mmap() functionality for files by default
	. also causes exec() to use it to map in executables
	  without copying and with sharing those pages with the
	  disk cache and other instances of the executable

Change-Id: Idb94dfe110eed916cf83b12c45e1a77241a2cee5
This commit is contained in:
Ben Gras 2013-09-13 12:05:50 +00:00
parent 4f52c9ea2e
commit b5951f9663
3 changed files with 7 additions and 1 deletions
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2
etc/boot.cfg.default
View file

@ -4,6 +4,6 @@ default=2
menu=Start MINIX 3:load_mods /boot/minix_default/mod*;multiboot /boot/minix_default/kernel rootdevname=$rootdevname $args
menu=Start latest MINIX 3:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname $args
menu=Start latest MINIX 3 in single user mode:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname bootopts=-s $args
menu=Start latest MINIX 3 with file mmap:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname filemap=1 $args
menu=Start latest MINIX 3 without file mmap:load_mods /boot/minix_latest/mod*;multiboot /boot/minix_latest/kernel rootdevname=$rootdevname filemap=0 $args
menu=Edit menu option:edit
menu=Drop to boot prompt:prompt

1
servers/vm/main.c
View file

@ -322,6 +322,7 @@ void init_vm(void)
}
/* Turn file mmap on? */
enable_filemap=1; /* yes by default */
env_parse("filemap", "d", 0, &enable_filemap, 0, 1);
/* Sanity check */

5
test/run
View file

@ -29,7 +29,12 @@ alltests=" 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 \
tests_no=`expr 0`
# test mmap only if enabled in sysenv
filemap=1 # the default is on
if sysenv filemap >/dev/null
then filemap=`sysenv filemap`
fi
if [ "$filemap" -ne 0 ]
then alltests="$alltests 74"
fi