clocksource: Limit number of CPUs checked for clock synchronization

[linux-2.6-microblaze.git] / Documentation / admin-guide / kernel-parameters.txt

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 5bcc229..9ec9ea1 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -581,6 +581,22 @@
                        loops can be debugged more effectively on production
                        systems.
 
+       clocksource.max_cswd_read_retries= [KNL]
+                       Number of clocksource_watchdog() retries due to
+                       external delays before the clock will be marked
+                       unstable.  Defaults to three retries, that is,
+                       four attempts to read the clock under test.
+
+       clocksource.verify_n_cpus= [KNL]
+                       Limit the number of CPUs checked for clocksources
+                       marked with CLOCK_SOURCE_VERIFY_PERCPU that
+                       are marked unstable due to excessive skew.
+                       A negative value says to check all CPUs, while
+                       zero says not to check any.  Values larger than
+                       nr_cpu_ids are silently truncated to nr_cpu_ids.
+                       The actual CPUs are chosen randomly, with
+                       no replacement if the same CPU is chosen twice.
+
        clearcpuid=BITNUM[,BITNUM...] [X86]
                        Disable CPUID feature X for the kernel. See
                        arch/x86/include/asm/cpufeatures.h for the valid bit
@@ -1835,6 +1851,18 @@
                        initcall functions.  Useful for debugging built-in
                        modules and initcalls.
 
+       initramfs_async= [KNL]
+                       Format: <bool>
+                       Default: 1
+                       This parameter controls whether the initramfs
+                       image is unpacked asynchronously, concurrently
+                       with devices being probed and
+                       initialized. This should normally just work,
+                       but as a debugging aid, one can get the
+                       historical behaviour of the initramfs
+                       unpacking being completed before device_ and
+                       late_ initcalls.
+
        initrd=         [BOOT] Specify the location of the initial ramdisk
 
        initrdmem=      [KNL] Specify a physical address and size from which to
@@ -3270,6 +3298,8 @@
 
        nohugeiomap     [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings.
 
+       nohugevmalloc   [PPC] Disable kernel huge vmalloc mappings.
+
        nosmt           [KNL,S390] Disable symmetric multithreading (SMT).
                        Equivalent to smt=1.