Author: markj Date: Wed Sep 25 17:08:35 2019 New Revision: 352690 URL: https://svnweb.freebsd.org/changeset/base/352690
Log: Add some counters for per-VM page events. For now, just count batched page queue state operations. vm.stats.page.queue_ops counts the number of batch entries that successfully completed, while queue_nops counts entries that had no effect, which occurs when the queue operation had been completed before the batch entry was processed. Reviewed by: alc, kib MFC after: 1 week Sponsored by: Intel, Netflix Differential Revision: https://reviews.freebsd.org/D21782 Modified: head/sys/vm/vm_page.c Modified: head/sys/vm/vm_page.c ============================================================================== --- head/sys/vm/vm_page.c Wed Sep 25 16:49:22 2019 (r352689) +++ head/sys/vm/vm_page.c Wed Sep 25 17:08:35 2019 (r352690) @@ -73,11 +73,12 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> #include <sys/systm.h> -#include <sys/lock.h> +#include <sys/counter.h> #include <sys/domainset.h> #include <sys/kernel.h> #include <sys/limits.h> #include <sys/linker.h> +#include <sys/lock.h> #include <sys/malloc.h> #include <sys/mman.h> #include <sys/msgbuf.h> @@ -130,6 +131,28 @@ static int vm_min_waiters; static int vm_severe_waiters; static int vm_pageproc_waiters; +static SYSCTL_NODE(_vm_stats, OID_AUTO, page, CTLFLAG_RD, 0, + "VM page statistics"); + +static counter_u64_t queue_ops = EARLY_COUNTER; +SYSCTL_COUNTER_U64(_vm_stats_page, OID_AUTO, queue_ops, + CTLFLAG_RD, &queue_ops, + "Number of batched queue operations"); + +static counter_u64_t queue_nops = EARLY_COUNTER; +SYSCTL_COUNTER_U64(_vm_stats_page, OID_AUTO, queue_nops, + CTLFLAG_RD, &queue_nops, + "Number of batched queue operations with no effects"); + +static void +counter_startup(void) +{ + + queue_ops = counter_u64_alloc(M_WAITOK); + queue_nops = counter_u64_alloc(M_WAITOK); +} +SYSINIT(page_counters, SI_SUB_CPU, SI_ORDER_ANY, counter_startup, NULL); + /* * bogus page -- for I/O to/from partially complete buffers, * or for paging into sparsely invalid regions. @@ -3117,6 +3140,7 @@ vm_pqbatch_process_page(struct vm_pagequeue *pq, vm_pa if (__predict_true((qflags & PGA_ENQUEUED) != 0)) vm_pagequeue_remove(pq, m); vm_page_dequeue_complete(m); + counter_u64_add(queue_ops, 1); } else if ((qflags & (PGA_REQUEUE | PGA_REQUEUE_HEAD)) != 0) { if ((qflags & PGA_ENQUEUED) != 0) TAILQ_REMOVE(&pq->pq_pl, m, plinks.q); @@ -3141,6 +3165,9 @@ vm_pqbatch_process_page(struct vm_pagequeue *pq, vm_pa vm_page_aflag_clear(m, qflags & (PGA_REQUEUE | PGA_REQUEUE_HEAD)); + counter_u64_add(queue_ops, 1); + } else { + counter_u64_add(queue_nops, 1); } } _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
