diff options
authorMichael Neuling <mikey@neuling.org>2007-02-10 01:44:33 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:24 -0800
commit0a7b35cb18c52d651f6ed9cd59edc979200ab880 (patch)
parent70e840499aae90be1de542894062ad2899d23642 (diff)
[PATCH] Add retain_initrd boot option
Add retain_initrd option to control freeing of initrd memory after extraction. By default, free memory as previously. The first boot will need to hold a copy of the in memory fs for the second boot. This image can be large (much larger than the kernel), hence we can save time when the memory loader is slow. Also, it reduces the memory footprint while extracting the first boot since you don't need another copy of the fs. Signed-off-by: Michael Neuling <mikey@neuling.org> Cc: "Randy.Dunlap" <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2 files changed, 18 insertions, 1 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 25d29851710..d25acd51e18 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1396,6 +1396,8 @@ and is between 256 and 4096 characters. It is defined in the file
in <PAGE_SIZE> units (needed only for swap files).
See Documentation/power/swsusp-and-swap-files.txt
+ retain_initrd [RAM] Keep initrd memory after extraction
rhash_entries= [KNL,NET]
Set number of hash buckets for route cache
diff --git a/init/initramfs.c b/init/initramfs.c
index 4fa0f7977de..00eff7a1108 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -491,6 +491,17 @@ static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
return message;
+static int __initdata do_retain_initrd;
+static int __init retain_initrd_param(char *str)
+ if (*str)
+ return 0;
+ do_retain_initrd = 1;
+ return 1;
+__setup("retain_initrd", retain_initrd_param);
extern char __initramfs_start[], __initramfs_end[];
#include <linux/initrd.h>
@@ -501,7 +512,11 @@ static void __init free_initrd(void)
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
+ if (do_retain_initrd)
+ goto skip;
* If the initrd region is overlapped with crashkernel reserved region,
* free only memory that is not part of crashkernel region.
@@ -519,7 +534,7 @@ static void __init free_initrd(void)
} else
free_initrd_mem(initrd_start, initrd_end);
initrd_start = 0;
initrd_end = 0;