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a3/system/Z575/OSes/3archlinux/on_baremetal/filesystem_now/archlinux/home/xftroxgpx/build/1packages/4used/kernel/linuxgit/le9d.patch
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| from: https://github.com/constantoverride/qubes-linux-kernel/blob/bbecb78ff38770367b0f1d18a1c860db401322c7/patches.addon/le9d.patch#L1 | |
| Warning: you need to run `echo 1 | sudo tee /proc/sys/vm/drop_caches` periodically, or else you can run out of memory when you wouldn't have otherwise without this patch. But hey at least it doesn't freakin' freeze/crash your system! | |
| So you can expect Xorg and xfwm4 to get killed due to some filesystem caching(eg. during `sha256sum -c`) or during firefox compilation with output in /tmp (tmpfs) filled with 12-13G out of 16G total computer RAM. | |
| I'm personally running on xfce startup: xfce4-terminal -x freepagecachepages_automatically 1000000 | |
| TODO: use this vmstat number(which is very different than /proc/meminfo one! eg. Active(file): 123524 kB): | |
| $ grep nr_active_file /proc/vmstat | |
| nr_active_file 29803 | |
| revision 3 | |
| preliminary patch to avoid disk thrashing (constant reading) under memory pressure before OOM-killer triggers | |
| more info: https://gist.github.com/constantoverride/84eba764f487049ed642eb2111a20830 | |
| diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h | |
| index 32699b2..7636498 100644 | |
| --- a/include/linux/mmzone.h | |
| +++ b/include/linux/mmzone.h | |
| @@ -208,7 +208,7 @@ enum lru_list { | |
| #define for_each_lru(lru) for (lru = 0; lru < NR_LRU_LISTS; lru++) | |
| -#define for_each_evictable_lru(lru) for (lru = 0; lru <= LRU_ACTIVE_FILE; lru++) | |
| +#define for_each_evictable_lru(lru) for (lru = 0; lru <= LRU_INACTIVE_FILE; lru++) | |
| static inline int is_file_lru(enum lru_list lru) | |
| { | |
| diff --git a/mm/vmscan.c b/mm/vmscan.c | |
| index 03822f8..1f3ffb5 100644 | |
| --- a/mm/vmscan.c | |
| +++ b/mm/vmscan.c | |
| @@ -2086,9 +2086,9 @@ static unsigned long shrink_list(enum lr | |
| struct scan_control *sc) | |
| { | |
| if (is_active_lru(lru)) { | |
| - if (inactive_list_is_low(lruvec, is_file_lru(lru), | |
| - memcg, sc, true)) | |
| - shrink_active_list(nr_to_scan, lruvec, sc, lru); | |
| + //if (inactive_list_is_low(lruvec, is_file_lru(lru), | |
| + // memcg, sc, true)) | |
| + // shrink_active_list(nr_to_scan, lruvec, sc, lru); | |
| return 0; | |
| } | |
| @@ -2234,7 +2234,7 @@ static void get_scan_count(struct lruvec *lruvec, struct mem_cgroup *memcg, | |
| anon = lruvec_lru_size(lruvec, LRU_ACTIVE_ANON, MAX_NR_ZONES) + | |
| lruvec_lru_size(lruvec, LRU_INACTIVE_ANON, MAX_NR_ZONES); | |
| - file = lruvec_lru_size(lruvec, LRU_ACTIVE_FILE, MAX_NR_ZONES) + | |
| + file = //lruvec_lru_size(lruvec, LRU_ACTIVE_FILE, MAX_NR_ZONES) + | |
| lruvec_lru_size(lruvec, LRU_INACTIVE_FILE, MAX_NR_ZONES); | |
| spin_lock_irq(&pgdat->lru_lock); | |
| @@ -2345,7 +2345,7 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc | |
| sc->priority == DEF_PRIORITY); | |
| blk_start_plug(&plug); | |
| - while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] || | |
| + while (nr[LRU_INACTIVE_ANON] || //nr[LRU_ACTIVE_FILE] || | |
| nr[LRU_INACTIVE_FILE]) { | |
| unsigned long nr_anon, nr_file, percentage; | |
| unsigned long nr_scanned; | |
| @@ -2372,7 +2372,8 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc | |
| * stop reclaiming one LRU and reduce the amount scanning | |
| * proportional to the original scan target. | |
| */ | |
| - nr_file = nr[LRU_INACTIVE_FILE] + nr[LRU_ACTIVE_FILE]; | |
| + nr_file = nr[LRU_INACTIVE_FILE] //+ nr[LRU_ACTIVE_FILE] | |
| + ; | |
| nr_anon = nr[LRU_INACTIVE_ANON] + nr[LRU_ACTIVE_ANON]; | |
| /* | |
| @@ -2391,7 +2392,8 @@ static void shrink_node_memcg(struct pglist_data *pgdat, struct mem_cgroup *memc | |
| percentage = nr_anon * 100 / scan_target; | |
| } else { | |
| unsigned long scan_target = targets[LRU_INACTIVE_FILE] + | |
| - targets[LRU_ACTIVE_FILE] + 1; | |
| + //targets[LRU_ACTIVE_FILE] + | |
| + 1; | |
| lru = LRU_FILE; | |
| percentage = nr_file * 100 / scan_target; | |
| } | |
| @@ -2409,10 +2411,12 @@ static void shrink_node_memcg(struct pgl | |
| nr[lru] = targets[lru] * (100 - percentage) / 100; | |
| nr[lru] -= min(nr[lru], nr_scanned); | |
| + if (LRU_FILE != lru) { //avoid this block for LRU_ACTIVE_FILE | |
| lru += LRU_ACTIVE; | |
| nr_scanned = targets[lru] - nr[lru]; | |
| nr[lru] = targets[lru] * (100 - percentage) / 100; | |
| nr[lru] -= min(nr[lru], nr_scanned); | |
| + } | |
| scan_adjusted = true; | |
| } |