svn commit: r352617 - head/sys/kern

[Cy Schubert]

In message <201909230853.x8N8rEnu024577 at repo.freebsd.org>, Mateusz Guzik 
writes
:
> Author: mjg
> Date: Mon Sep 23 08:53:14 2019
> New Revision: 352617
> URL: https://svnweb.freebsd.org/changeset/base/352617
>
> Log:
>   cache: count evictions of negatve entries

Why?

>   
>   Sponsored by:	The FreeBSD Foundation
>
> Modified:
>   head/sys/kern/vfs_cache.c
>
> Modified: head/sys/kern/vfs_cache.c
> =============================================================================
> =
> --- head/sys/kern/vfs_cache.c	Mon Sep 23 07:23:29 2019	(r352616)
> +++ head/sys/kern/vfs_cache.c	Mon Sep 23 08:53:14 2019	(r352617)
> @@ -378,6 +378,8 @@ STATNODE_COUNTER(numfullpathfail2,
>      "Number of fullpath search errors (VOP_VPTOCNP failures)");
>  STATNODE_COUNTER(numfullpathfail4, "Number of fullpath search errors (ENOMEM
> )");
>  STATNODE_COUNTER(numfullpathfound, "Number of successful fullpath calls");
> +static long numneg_evicted; STATNODE_ULONG(numneg_evicted,
> +    "Number of negative entries evicted when adding a new entry");
>  STATNODE_COUNTER(zap_and_exit_bucket_relock_success,
>      "Number of successful removals after relocking");
>  static long zap_and_exit_bucket_fail; STATNODE_ULONG(zap_and_exit_bucket_fai
> l,
> @@ -844,6 +846,7 @@ cache_negative_zap_one(void)
>  	    ncp->nc_name, ncp->nc_neghits);
>  
>  	cache_zap_locked(ncp, true);
> +	numneg_evicted++;
>  out_unlock_all:
>  	mtx_unlock(&neglist->nl_lock);
>  	rw_wunlock(blp);
>



-- 
Cheers,
Cy Schubert <Cy.Schubert at cschubert.com>
FreeBSD UNIX:  <cy at FreeBSD.org>   Web:  http://www.FreeBSD.org

	The need of the many outweighs the greed of the few.