From e177ea28e7eded3490174487c81e5bef8a2c4d95 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Thu, 18 Jul 2002 21:09:17 -0700 Subject: [PATCH] VM instrumentation A patch from Rik which adds some operational statitics to the VM. In /proc/meminfo: PageTables: Amount of memory used for process pagetables PteChainTot: Amount of memory allocated for pte_chain objects PteChainUsed: Amount of memory currently in use for pte chains. In /proc/stat: pageallocs: Number of pages allocated in the page allocator pagefrees: Number of pages returned to the page allocator (These can be used to measure the allocation rate) pageactiv: Number of pages activated (moved to the active list) pagedeact: Number of pages deactivated (moved to the inactive list) pagefault: Total pagefaults majorfault: Major pagefaults pagescan: Number of pages which shrink_cache looked at pagesteal: Number of pages which shrink_cache freed pageoutrun: Number of calls to try_to_free_pages() allocstall: Number of calls to balance_classzone() Rik will be writing a userspace app which interprets these things. The /proc/meminfo stats are efficient, but the /proc/stat accumulators will cause undesirable cacheline bouncing. We need to break the disk statistics out of struct kernel_stat and make everything else in there per-cpu. If that doesn't happen in time for 2.6 then we disable KERNEL_STAT_INC(). --- include/linux/kernel_stat.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'include/linux/kernel_stat.h') diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h index de592f2ba451..75533ee86b73 100644 --- a/include/linux/kernel_stat.h +++ b/include/linux/kernel_stat.h @@ -26,6 +26,11 @@ struct kernel_stat { unsigned int dk_drive_wblk[DK_MAX_MAJOR][DK_MAX_DISK]; unsigned int pgpgin, pgpgout; unsigned int pswpin, pswpout; + unsigned int pgalloc, pgfree; + unsigned int pgactivate, pgdeactivate; + unsigned int pgfault, pgmajfault; + unsigned int pgscan, pgsteal; + unsigned int pageoutrun, allocstall; #if !defined(CONFIG_ARCH_S390) unsigned int irqs[NR_CPUS][NR_IRQS]; #endif @@ -35,6 +40,13 @@ extern struct kernel_stat kstat; extern unsigned long nr_context_switches(void); +/* + * Maybe we need to smp-ify kernel_stat some day. It would be nice to do + * that without having to modify all the code that increments the stats. + */ +#define KERNEL_STAT_INC(x) kstat.x++ +#define KERNEL_STAT_ADD(x, y) kstat.x += y + #if !defined(CONFIG_ARCH_S390) /* * Number of interrupts per specific IRQ source, since bootup -- cgit v1.2.3