perf-help(1) ============ NAME ---- perf-help - display help information about perf SYNOPSIS -------- 'perf help' [-a|--all] [COMMAND] DESCRIPTION ----------- With no options and no COMMAND given, the synopsis of the 'perf' command and a list of the most commonly used perf commands are printed on the standard output. If the option '--all' or '-a' is given, then all available commands are printed on the standard output. If a perf command is named, a manual page for that command is brought up. The 'man' program is used by default for this purpose, but this can be overridden by other options or configuration variables. Note that `perf --help ...` is identical to `perf help ...` because the former is internally converted into the latter. OPTIONS ------- -a:: --all:: Prints all the available commands on the standard output. This option supersedes any other option. PERF ---- Part of the linkperf:perf[1] suite 0ae5b42828785b589f686725ff5bc3b9b25'/> net-next plumbingsTobias Klauser
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /fs/xfs/libxfs/xfs_trans_resv.c
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'fs/xfs/libxfs/xfs_trans_resv.c')