From e16a9d9543773c7169e4c6a5a3b4586b398696af Mon Sep 17 00:00:00 2001 From: Steven Barrett Date: Wed, 11 Aug 2021 18:41:50 -0500 Subject: [PATCH] ZEN: Tune mgLRU to protect cache used in the last second Although not identical to the le9 patches that protect a byte-amount of cache through tunables, multigenerational LRU now supports protecting cache accessed in the last X milliseconds. In #218, Yu recommends starting with 1000ms and tuning as needed. This looks like a safe default and turning on this feature should help users that don't know they need it. --- mm/vmscan.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 97f8a4dcb37c55..32daf9c950a270 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -4604,7 +4604,11 @@ static bool lruvec_is_reclaimable(struct lruvec *lruvec, struct scan_control *sc } /* to protect the working set of the last N jiffies */ +#ifdef CONFIG_ZEN_INTERACTIVE +static unsigned long lru_gen_min_ttl __read_mostly = HZ; +#else static unsigned long lru_gen_min_ttl __read_mostly; +#endif static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc) {