Rules on how to use sysfs in userspace programs

[linux-2.6-omap-h63xx.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index aae2282600ca411320cd611c3830d260d43713eb..4d880b3d1f35548083613a18d695d68029382c81 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -170,7 +170,10 @@ and is between 256 and 4096 characters. It is defined in the file
        acpi_os_name=   [HW,ACPI] Tell ACPI BIOS the name of the OS
                        Format: To spoof as Windows 98: ="Microsoft Windows"
 
-       acpi_osi=       [HW,ACPI] empty param disables _OSI
+       acpi_osi=       [HW,ACPI] Modify list of supported OS interface strings
+                       acpi_osi="string1"      # add string1 -- only one string
+                       acpi_osi="!string2"     # remove built-in string2
+                       acpi_osi=               # disable all strings
 
        acpi_serialize  [HW,ACPI] force serialization of AML methods
 
@@ -220,11 +223,6 @@ and is between 256 and 4096 characters. It is defined in the file
 
        acpi_fake_ecdt  [HW,ACPI] Workaround failure due to BIOS lacking ECDT
 
-       acpi_generic_hotkey [HW,ACPI]
-                       Allow consolidated generic hotkey driver to
-                       override platform specific driver.
-                       See also Documentation/acpi-hotkey.txt.
-
        acpi_pm_good    [IA-32,X86-64]
                        Override the pmtimer bug detection: force the kernel
                        to assume that this machine's pmtimer latches its value
@@ -1016,49 +1014,6 @@ and is between 256 and 4096 characters. It is defined in the file
 
        mga=            [HW,DRM]
 
-       migration_cost=
-                       [KNL,SMP] debug: override scheduler migration costs
-                       Format: <level-1-usecs>,<level-2-usecs>,...
-                       This debugging option can be used to override the
-                       default scheduler migration cost matrix. The numbers
-                       are indexed by 'CPU domain distance'.
-                       E.g. migration_cost=1000,2000,3000 on an SMT NUMA
-                       box will set up an intra-core migration cost of
-                       1 msec, an inter-core migration cost of 2 msecs,
-                       and an inter-node migration cost of 3 msecs.
-
-                       WARNING: using the wrong values here can break
-                       scheduler performance, so it's only for scheduler
-                       development purposes, not production environments.
-
-       migration_debug=
-                       [KNL,SMP] migration cost auto-detect verbosity
-                       Format=<0|1|2>
-                       If a system's migration matrix reported at bootup
-                       seems erroneous then this option can be used to
-                       increase verbosity of the detection process.
-                       We default to 0 (no extra messages), 1 will print
-                       some more information, and 2 will be really
-                       verbose (probably only useful if you also have a
-                       serial console attached to the system).
-
-       migration_factor=
-                       [KNL,SMP] multiply/divide migration costs by a factor
-                       Format=<percent>
-                       This debug option can be used to proportionally
-                       increase or decrease the auto-detected migration
-                       costs for all entries of the migration matrix.
-                       E.g. migration_factor=150 will increase migration
-                       costs by 50%. (and thus the scheduler will be less
-                       eager migrating cache-hot tasks)
-                       migration_factor=80 will decrease migration costs
-                       by 20%. (thus the scheduler will be more eager to
-                       migrate tasks)
-
-                       WARNING: using the wrong values here can break
-                       scheduler performance, so it's only for scheduler
-                       development purposes, not production environments.
-
        mousedev.tap_time=
                        [MOUSE] Maximum time between finger touching and
                        leaving touchpad surface for touch to be considered
@@ -1132,9 +1087,9 @@ and is between 256 and 4096 characters. It is defined in the file
                        when set.
                        Format: <int>
 
-       noaliencache    [MM, NUMA] Disables the allcoation of alien caches in
-                       the slab allocator.  Saves per-node memory, but will
-                       impact performance on real NUMA hardware.
+       noaliencache    [MM, NUMA, SLAB] Disables the allocation of alien
+                       caches in the slab allocator.  Saves per-node memory,
+                       but will impact performance.
 
        noalign         [KNL,ARM]
 
@@ -1613,6 +1568,37 @@ and is between 256 and 4096 characters. It is defined in the file
 
        slram=          [HW,MTD]
 
+       slub_debug      [MM, SLUB]
+                       Enabling slub_debug allows one to determine the culprit
+                       if slab objects become corrupted. Enabling slub_debug
+                       creates guard zones around objects and poisons objects
+                       when not in use. Also tracks the last alloc / free.
+                       For more information see Documentation/vm/slub.txt.
+
+       slub_max_order= [MM, SLUB]
+                       Determines the maximum allowed order for slabs. Setting
+                       this too high may cause fragmentation.
+                       For more information see Documentation/vm/slub.txt.
+
+       slub_min_objects=       [MM, SLUB]
+                       The minimum objects per slab. SLUB will increase the
+                       slab order up to slub_max_order to generate a
+                       sufficiently big slab to satisfy the number of objects.
+                       The higher the number of objects the smaller the overhead
+                       of tracking slabs.
+                       For more information see Documentation/vm/slub.txt.
+
+       slub_min_order= [MM, SLUB]
+                       Determines the mininum page order for slabs. Must be
+                       lower than slub_max_order
+                       For more information see Documentation/vm/slub.txt.
+
+       slub_nomerge    [MM, SLUB]
+                       Disable merging of slabs of similar size. May be
+                       necessary if there is some reason to distinguish
+                       allocs to different slabs.
+                       For more information see Documentation/vm/slub.txt.
+
        smart2=         [HW]
                        Format: <io1>[,<io2>[,...,<io8>]]