spl-module-parameters.5: remove spl_kmem_cache_{expire,obj_per_slab_min}

Both were removed in 4fbdb10 ("remove
kmem_cache module parameter KMC_EXPIRE_AGE")

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes openzfs#12157

man/man5/spl-module-parameters.5

@@ -14,33 +14,6 @@ Description of the different parameters to the SPL module.
 .sp
 .LP
 
-.sp
-.ne 2
-.na
-\fBspl_kmem_cache_expire\fR (uint)
-.ad
-.RS 12n
-Cache expiration is part of default Illumos cache behavior.  The idea is
-that objects in magazines which have not been recently accessed should be
-returned to the slabs periodically.  This is known as cache aging and
-when enabled objects will be typically returned after 15 seconds.
-.sp
-On the other hand Linux slabs are designed to never move objects back to
-the slabs unless there is memory pressure.  This is possible because under
-Linux the cache will be notified when memory is low and objects can be
-released.
-.sp
-By default only the Linux method is enabled.  It has been shown to improve
-responsiveness on low memory systems and not negatively impact the performance
-of systems with more memory.  This policy may be changed by setting the
-\fBspl_kmem_cache_expire\fR bit mask as follows, both policies may be enabled
-concurrently.
-.sp
-0x01 - Aging (Illumos), 0x02 - Low memory (Linux)
-.sp
-Default value: \fB0x02\fR
-.RE
-
 .sp
 .ne 2
 .na
@@ -85,20 +58,6 @@ take longer.
 Default value: \fB8\fR
 .RE
 
-.sp
-.ne 2
-.na
-\fBspl_kmem_cache_obj_per_slab_min\fR (uint)
-.ad
-.RS 12n
-The minimum number of objects allowed per slab.  Normally slabs will contain
-\fBspl_kmem_cache_obj_per_slab\fR objects but for caches that contain very
-large objects it's desirable to only have a few, or even just one, object per
-slab.
-.sp
-Default value: \fB1\fR
-.RE
-
 .sp
 .ne 2
 .na

module/os/linux/spl/spl-kmem-cache.c

@@ -527,9 +527,7 @@ spl_cache_flush(spl_kmem_cache_t *skc, spl_kmem_magazine_t *skm, int flush)
  * Size a slab based on the size of each aligned object plus spl_kmem_obj_t.
  * When on-slab we want to target spl_kmem_cache_obj_per_slab.  However,
  * for very small objects we may end up with more than this so as not
- * to waste space in the minimal allocation of a single page.  Also for
- * very large objects we may use as few as spl_kmem_cache_obj_per_slab_min,
- * lower than this and we will fail.
+ * to waste space in the minimal allocation of a single page.
  */
 static int
 spl_slab_size(spl_kmem_cache_t *skc, uint32_t *objs, uint32_t *size)