The patch titled
cpualloc: make the per cpu reserve configurable
has been removed from the -mm tree. Its filename was
cpualloc-make-the-per-cpu-reserve-configurable.patch
This patch was dropped because it got shat on
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cpualloc: make the per cpu reserve configurable
From: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
The per cpu reserve from which loadable modules allocate their percpu
sections is currently fixed at 8000 bytes.
Add a new kernel parameter
percpu=<dynamically allocatable percpu bytes>
The per cpu reserve area will be used in following patches by the per cpu
allocator.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 7 +++++++
include/linux/percpu.h | 3 ++-
init/main.c | 12 ++++++++++++
3 files changed, 21 insertions(+), 1 deletion(-)
diff -puN Documentation/kernel-parameters.txt~cpualloc-make-the-per-cpu-reserve-configurable Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~cpualloc-make-the-per-cpu-reserve-configurable
+++ a/Documentation/kernel-parameters.txt
@@ -1773,6 +1773,13 @@ and is between 256 and 4096 characters.
Format: { 0 | 1 }
See arch/parisc/kernel/pdc_chassis.c
+ percpu= Configure the number of percpu bytes that can be
+ dynamically allocated. This is used for per cpu
+ variables of modules and other dynamic per cpu data
+ structures. Creation of per cpu structures after boot
+ may fail if this is set too low.
+ Default is 8000 bytes.
+
pf. [PARIDE]
See Documentation/paride.txt.
diff -puN include/linux/percpu.h~cpualloc-make-the-per-cpu-reserve-configurable include/linux/percpu.h
--- a/include/linux/percpu.h~cpualloc-make-the-per-cpu-reserve-configurable
+++ a/include/linux/percpu.h
@@ -56,6 +56,7 @@
#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
+extern unsigned int percpu_reserve;
/* Enough to cover all DEFINE_PER_CPUs in kernel, including modules. */
#ifndef PERCPU_ENOUGH_ROOM
#ifdef CONFIG_MODULES
@@ -65,7 +66,7 @@
#endif
#define PERCPU_ENOUGH_ROOM \
- (__per_cpu_end - __per_cpu_start + PERCPU_MODULE_RESERVE)
+ (__per_cpu_end - __per_cpu_start + percpu_reserve)
#endif /* PERCPU_ENOUGH_ROOM */
/*
diff -puN init/main.c~cpualloc-make-the-per-cpu-reserve-configurable init/main.c
--- a/init/main.c~cpualloc-make-the-per-cpu-reserve-configurable
+++ a/init/main.c
@@ -258,6 +258,16 @@ static int __init loglevel(char *str)
early_param("loglevel", loglevel);
+unsigned int percpu_reserve = PERCPU_MODULE_RESERVE;
+
+static int __init init_percpu_reserve(char *str)
+{
+ get_option(&str, &percpu_reserve);
+ return 0;
+}
+
+early_param("percpu", init_percpu_reserve);
+
/*
* Unknown boot options get handed to init, unless they look like
* failed parameters
@@ -407,6 +417,8 @@ static void __init setup_per_cpu_areas(v
da_size = per_cpu_dyn_array_size(&align);
align = max_t(unsigned long, PAGE_SIZE, align);
size = ALIGN(old_size + da_size, align);
+ printk(KERN_INFO "percpu area: %d bytes total, %d available.\n",
+ size, size - (__per_cpu_end - __per_cpu_start));
ptr = alloc_bootmem_pages(size * nr_possible_cpus);
for_each_possible_cpu(i) {
_
Patches currently in -mm which might be from cl@xxxxxxxxxxxxxxxxxxxx are
repeatable-slab-corruption-with-ltp-msgctl08.patch
git-tip.patch
git-slab.patch
vmscan-use-an-indexed-array-for-lru-variables.patch
cpualloc-make-the-per-cpu-reserve-configurable.patch
cpualloc-make-the-per-cpu-reserve-configurable-fix.patch
cpualloc-percpu-rename-variables-percpu_enough_room-percpu_area_size.patch
cpualloc-the-allocator.patch
cpu_alloc-remove-useless-variable.patch
cpualloc-use-cpu-allocator-instead-of-the-builtin-modules-per-cpu-allocator.patch
cpualloc-use-cpu-allocator-instead-of-the-builtin-modules-per-cpu-allocator-checkpatch-fixes.patch
reiser4.patch
page-owner-tracking-leak-detector.patch
slab-leaks3-default-y.patch
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