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| author | Andrew Morton <akpm@zip.com.au> | 2002-07-18 21:09:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@home.transmeta.com> | 2002-07-18 21:09:17 -0700 |
| commit | e177ea28e7eded3490174487c81e5bef8a2c4d95 (patch) | |
| tree | 3a4422d4f04b7643fd14e809e7b8385246122bd9 /init | |
| parent | 6a2ea3382b534e937ba2153f4a0c6021e04a1ef5 (diff) | |
[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().
Diffstat (limited to 'init')
| -rw-r--r-- | init/main.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c index 922ea974aaf9..81879f47768f 100644 --- a/init/main.c +++ b/init/main.c @@ -28,6 +28,7 @@ #include <linux/bootmem.h> #include <linux/tty.h> #include <linux/percpu.h> +#include <linux/kernel_stat.h> #include <asm/io.h> #include <asm/bugs.h> @@ -502,6 +503,8 @@ static int init(void * unused) free_initmem(); unlock_kernel(); + kstat.pgfree = 0; + if (open("/dev/console", O_RDWR, 0) < 0) printk("Warning: unable to open an initial console.\n"); |