Commit 0a7b35cb authored by Michael Neuling's avatar Michael Neuling Committed by Linus Torvalds

[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: default avatarMichael Neuling <>
Cc: "Randy.Dunlap" <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 70e84049
......@@ -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
......@@ -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;
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