• Andrew Morton's avatar
    [PATCH] VM instrumentation · e177ea28
    Andrew Morton authored
    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().
    e177ea28
page-flags.h 8.91 KB