Re: [PATCH] namei: Remove unlikely annotation for revalidate check in lookup_fast()

[Al Viro]

On Mon, Feb 06, 2017 at 05:17:35PM -0500, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
> 
> The likely/unlikely profiler showed that the unlikely around the
> dentry->d_flags & DCACHE_OP_REVALIDATE was wrong 95% of the time. Adding
> trace_printk()s, it revealed that the dentry ops had hooks to:
> 
>  kernfs_dop_revalidate
>  pid_revalidate
>  proc_sys_revalidate
>  tid_fd_revalidate
> 
> As tools today now access files that have these operations often, it's best
> just to remove the annotation, as it is more dependent on use cases and not
> normal mode of operation if it will be true or not.

"Tools" being what, exactly?  What kind of load had that been measured on?