From f5b82cc382eaf3ddf5c26f60965037bde8733445 Mon Sep 17 00:00:00 2001 From: Steven Barrett Date: Wed, 11 Aug 2021 18:47:46 -0500 Subject: ZEN: INTERACTIVE: 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. --- init/Kconfig | 1 + mm/vmscan.c | 4 ++++ 2 files changed, 5 insertions(+) --- a/init/Kconfig +++ b/init/Kconfig @@ -148,6 +148,7 @@ config ZEN_INTERACTIVE --- Virtual Memory Subsystem --------------------------- Background-reclaim hugepages...: no -> yes + MG-LRU minimum cache TTL.......: 0 -> 1000 ms config BROKEN bool --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3968,7 +3968,11 @@ static bool lruvec_is_reclaimable(struct } /* 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) {