Merge tag 'perf-urgent-for-mingo-20160324' of git://git.kernel.org/pub/scm/linux...

[cascardo/linux.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 87298f8..4d9ca7d 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -666,7 +666,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        clearcpuid=BITNUM [X86]
                        Disable CPUID feature X for the kernel. See
-                       arch/x86/include/asm/cpufeature.h for the valid bit
+                       arch/x86/include/asm/cpufeatures.h for the valid bit
                        numbers. Note the Linux specific bits are not necessarily
                        stable over kernel options, but the vendor specific
                        ones should be.
@@ -2575,6 +2575,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        nointroute      [IA-64]
 
+       noinvpcid       [X86] Disable the INVPCID cpu feature.
+
        nojitter        [IA-64] Disables jitter checking for ITC timers.
 
        no-kvmclock     [X86,KVM] Disable paravirtualized KVM clock driver
@@ -3500,6 +3502,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        ro              [KNL] Mount root device read-only on boot
 
+       rodata=         [KNL]
+               on      Mark read-only kernel memory as read-only (default).
+               off     Leave read-only kernel memory writable for debugging.
+
        root=           [KNL] Root filesystem
                        See name_to_dev_t comment in init/do_mounts.c.
 
@@ -3537,6 +3543,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
        sched_debug     [KNL] Enables verbose scheduler debug messages.
 
+       schedstats=     [KNL,X86] Enable or disable scheduled statistics.
+                       Allowed values are enable and disable. This feature
+                       incurs a small amount of overhead in the scheduler
+                       but is useful for debugging and performance tuning.
+
        skew_tick=      [KNL] Offset the periodic timer tick per cpu to mitigate
                        xtime_lock contention on larger systems, and/or RCU lock
                        contention on all systems with CONFIG_MAXSMP set.
@@ -4244,6 +4255,17 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        The default value of this parameter is determined by
                        the config option CONFIG_WQ_POWER_EFFICIENT_DEFAULT.
 
+       workqueue.debug_force_rr_cpu
+                       Workqueue used to implicitly guarantee that work
+                       items queued without explicit CPU specified are put
+                       on the local CPU.  This guarantee is no longer true
+                       and while local CPU is still preferred work items
+                       may be put on foreign CPUs.  This debug option
+                       forces round-robin CPU selection to flush out
+                       usages which depend on the now broken guarantee.
+                       When enabled, memory and cache locality will be
+                       impacted.
+
        x2apic_phys     [X86-64,APIC] Use x2apic physical mode instead of
                        default x2apic cluster mode on platforms
                        supporting x2apic.