add some kinfo structs and sysctl mibs for info about per cpu pool caches

there are two sysctls, one that shows info about the pools global
cache info, and another that dumps info about the caches on all the
cpus in one go.

ok mikeb@ millert@

diff --git a/sys/sys/pool.h b/sys/sys/pool.h
index 6923853..1a5380e 100644 (file)
--- a/sys/sys/pool.h
+++ b/sys/sys/pool.h
@@ -1,4 +1,4 @@
-/*     $OpenBSD: pool.h,v 1.69 2017/02/07 05:39:17 dlg Exp $   */
+/*     $OpenBSD: pool.h,v 1.70 2017/06/15 02:52:30 dlg Exp $   */
 /*     $NetBSD: pool.h,v 1.27 2001/06/06 22:00:17 rafal Exp $  */
 
 /*-
@@ -43,6 +43,8 @@
 #define KERN_POOL_NPOOLS       1
 #define KERN_POOL_NAME         2
 #define KERN_POOL_POOL         3
+#define KERN_POOL_CACHE                4       /* global pool cache info */
+#define KERN_POOL_CACHE_CPUS   5       /* all cpus cache info */
 
 struct kinfo_pool {
        unsigned int    pr_size;        /* size of a pool item */
@@ -66,6 +68,31 @@ struct kinfo_pool {
        unsigned long   pr_nidle;       /* # of idle pages */
 };
 
+struct kinfo_pool_cache {
+       uint64_t        pr_ngc;         /* # of times a list has been gc'ed */
+       unsigned int    pr_len;         /* current target for list len */
+       unsigned int    pr_nlist;       /* # of lists in the pool */
+       unsigned int    pr_contention;  /* # of times mtx was busy */
+};
+
+/*
+ * KERN_POOL_CACHE_CPUS provides an array, not a single struct. ie, it
+ * provides struct kinfo_pool_cache_cpu kppc[ncpusfound].
+ */
+struct kinfo_pool_cache_cpu {
+       unsigned int    pr_cpu;         /* which cpu this cache is on */
+
+       /* counters for times items were handled by the cache */
+       uint64_t        pr_nget;        /* # of requests */
+       uint64_t        pr_nfail;       /* # of unsuccessful requests */
+       uint64_t        pr_nput;        /* # of releases */
+
+       /* counters for times the cache interacted with the pool */
+       uint64_t        pr_nlget;       /* # of list requests */
+       uint64_t        pr_nlfail;      /* # of unsuccessful list requests */
+       uint64_t        pr_nlput;       /* # of list releases */
+};
+
 #if defined(_KERNEL) || defined(_LIBKVM)
 
 #include <sys/queue.h>
@@ -159,8 +186,8 @@ struct pool {
        struct mutex    pr_cache_mtx;
        struct pool_cache_lists
                        pr_cache_lists;
-       u_int           pr_cache_nlist;
-       u_int           pr_cache_items;
+       u_int           pr_cache_nlist; /* # of lists */
+       u_int           pr_cache_items; /* target list length */
        u_int           pr_cache_contention;
        int             pr_cache_nout;