vfs: cache request_queue in struct block_device

[karo-tx-linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 81c287fad79d6370d0d697d5ddf33b8af756a036..7ad82479f4e955d65238a0f30d5d05fa939ece84 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -623,6 +623,25 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        no_debug_objects
                        [KNL] Disable object debugging
 
+       debug_guardpage_minorder=
+                       [KNL] When CONFIG_DEBUG_PAGEALLOC is set, this
+                       parameter allows control of the order of pages that will
+                       be intentionally kept free (and hence protected) by the
+                       buddy allocator. Bigger value increase the probability
+                       of catching random memory corruption, but reduce the
+                       amount of memory for normal system use. The maximum
+                       possible value is MAX_ORDER/2.  Setting this parameter
+                       to 1 or 2 should be enough to identify most random
+                       memory corruption problems caused by bugs in kernel or
+                       driver code when a CPU writes to (or reads from) a
+                       random memory location. Note that there exists a class
+                       of memory corruptions problems caused by buggy H/W or
+                       F/W or by drivers badly programing DMA (basically when
+                       memory is written at bus level and the CPU MMU is
+                       bypassed) which are not detectable by
+                       CONFIG_DEBUG_PAGEALLOC, hence this option will not help
+                       tracking down these problems.
+
        debugpat        [X86] Enable PAT debugging
 
        decnet.addr=    [HW,NET]
@@ -1059,7 +1078,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                nomerge
                forcesac
                soft
-               pt      [x86, IA-64]
+               pt              [x86, IA-64]
+               group_mf        [x86, IA-64]
+
 
        io7=            [HW] IO7 for Marvel based alpha systems
                        See comment before marvel_specify_io7 in
@@ -1796,6 +1817,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
        nomfgpt         [X86-32] Disable Multi-Function General Purpose
                        Timer usage (for AMD Geode machines).
 
+       nonmi_ipi       [X86] Disable using NMI IPIs during panic/reboot to
+                       shutdown the other cpus.  Instead use the REBOOT_VECTOR
+                       irq.
+
        nopat           [X86] Disable PAT (page attribute table extension of
                        pagetables) support.
 
@@ -1885,6 +1910,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        arch_perfmon: [X86] Force use of architectural
                                perfmon on Intel CPUs instead of the
                                CPU specific event set.
+                       timer: [X86] Force use of architectural NMI
+                               timer mode (see also oprofile.timer
+                               for generic hr timer mode)
+                               [s390] Force legacy basic mode sampling
+                                (report cpu_type "timer")
 
        oops=panic      Always panic on oopses. Default is to just kill the
                        process, but there is a small probability of
@@ -2362,6 +2392,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        slram=          [HW,MTD]
 
+       slab_max_order= [MM, SLAB]
+                       Determines the maximum allowed order for slabs.
+                       A high setting may cause OOMs due to memory
+                       fragmentation.  Defaults to 1 for systems with
+                       more than 32MB of RAM, 0 otherwise.
+
        slub_debug[=options[,slabs]]    [MM, SLUB]
                        Enabling slub_debug allows one to determine the
                        culprit if slab objects become corrupted. Enabling
@@ -2632,6 +2668,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        [USB] Start with the old device initialization
                        scheme (default 0 = off).
 
+       usbcore.usbfs_memory_mb=
+                       [USB] Memory limit (in MB) for buffers allocated by
+                       usbfs (default = 16, 0 = max = 2047).
+
        usbcore.use_both_schemes=
                        [USB] Try the other device initialization scheme
                        if the first one fails (default 1 = enabled).
@@ -2750,11 +2790,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        functions are at fixed addresses, they make nice
                        targets for exploits that can control RIP.
 
-                       emulate     Vsyscalls turn into traps and are emulated
-                                   reasonably safely.
+                       emulate     [default] Vsyscalls turn into traps and are
+                                   emulated reasonably safely.
 
-                       native      [default] Vsyscalls are native syscall
-                                   instructions.
+                       native      Vsyscalls are native syscall instructions.
                                    This is a little bit faster than trapping
                                    and makes a few dynamic recompilers work
                                    better than they would in emulation mode.