* Liu Yuan <namei.unix@xxxxxxxxx> wrote: > + if (likely(!retry_find) && page && PageUptodate(page)) > + page_cache_acct_hit(inode->i_sb, READ); > + else > + page_cache_acct_missed(inode->i_sb, READ); Sigh. This would make such a nice tracepoint or sw perf event. It could be collected in a 'count' form, equivalent to the stats you are aiming for here, or it could even be traced, if someone is interested in such details. It could be mixed with other events, enriching multiple apps at once. But, instead of trying to improve those aspects of our existing instrumentation frameworks, mm/* is gradually growing its own special instrumentation hacks, missing the big picture and fragmenting the instrumentation space some more. That trend is somewhat sad. Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>