diff options
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 24 | ||||
| -rw-r--r-- | init/do_mounts.c | 7 | ||||
| -rw-r--r-- | init/main.c | 5 |
3 files changed, 27 insertions, 9 deletions
diff --git a/init/Kconfig b/init/Kconfig index a7e48796d57..e63a017c391 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -502,6 +502,15 @@ config VM_EVENT_COUNTERS on EMBEDDED systems. /proc/vmstat will only show page counts if VM event counters are disabled. +config SLUB_DEBUG + default y + bool "Enable SLUB debugging support" if EMBEDDED + help + SLUB has extensive debug support features. Disabling these can + result in significant savings in code size. This also disables + SLUB sysfs support. /sys/slab will not exist and there will be + no support for cache validation etc. + choice prompt "Choose SLAB allocator" default SLAB @@ -512,9 +521,9 @@ config SLAB bool "SLAB" help The regular slab allocator that is established and known to work - well in all environments. It organizes chache hot objects in + well in all environments. It organizes cache hot objects in per cpu and per node queues. SLAB is the default choice for - slab allocator. + a slab allocator. config SLUB depends on EXPERIMENTAL && !ARCH_USES_SLAB_PAGE_STRUCT @@ -524,21 +533,20 @@ config SLUB instead of managing queues of cached objects (SLAB approach). Per cpu caching is realized using slabs of objects instead of queues of objects. SLUB can use memory efficiently - way and has enhanced diagnostics. + and has enhanced diagnostics. config SLOB # -# SLOB cannot support SMP because SLAB_DESTROY_BY_RCU does not work -# properly. +# SLOB does not support SMP because SLAB_DESTROY_BY_RCU is unsupported # depends on EMBEDDED && !SMP && !SPARSEMEM bool "SLOB (Simple Allocator)" help SLOB replaces the SLAB allocator with a drastically simpler allocator. SLOB is more space efficient that SLAB but does not - scale well (single lock for all operations) and is more susceptible - to fragmentation. SLOB it is a great choice to reduce - memory usage and code size for embedded systems. + scale well (single lock for all operations) and is also highly + susceptible to fragmentation. SLUB can accomplish a higher object + density. It is usually better to use SLUB instead of SLOB. endchoice diff --git a/init/do_mounts.c b/init/do_mounts.c index 3f57ed4599d..46fe407fb03 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -7,6 +7,7 @@ #include <linux/root_dev.h> #include <linux/security.h> #include <linux/delay.h> +#include <linux/genhd.h> #include <linux/mount.h> #include <linux/device.h> #include <linux/init.h> @@ -308,17 +309,21 @@ retry: /* * Allow the user to distinguish between failed sys_open * and bad superblock on root device. + * and give them a list of the available devices */ #ifdef CONFIG_BLOCK __bdevname(ROOT_DEV, b); #endif printk("VFS: Cannot open root device \"%s\" or %s\n", root_device_name, b); - printk("Please append a correct \"root=\" boot option\n"); + printk("Please append a correct \"root=\" boot option; here are the available partitions:\n"); + printk_all_partitions(); panic("VFS: Unable to mount root fs on %s", b); } + printk("List of all partitions:\n"); + printk_all_partitions(); printk("No filesystem could mount root, tried: "); for (p = fs_names; *p; p += strlen(p)+1) printk(" %s", p); diff --git a/init/main.c b/init/main.c index c1537e0ddce..e8d080cab44 100644 --- a/init/main.c +++ b/init/main.c @@ -54,6 +54,7 @@ #include <linux/lockdep.h> #include <linux/pid_namespace.h> #include <linux/device.h> +#include <linux/kthread.h> #include <asm/io.h> #include <asm/bugs.h> @@ -425,8 +426,12 @@ static void __init setup_command_line(char *command_line) static void noinline rest_init(void) __releases(kernel_lock) { + int pid; + kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND); numa_default_policy(); + pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES); + kthreadd_task = find_task_by_pid(pid); unlock_kernel(); /* |