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ferreo 2024-11-18 15:21:53 +01:00
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commit fb898cd2de
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From 95eac316f9bb32c4e33e64616876c2ab1dfaf3f4 Mon Sep 17 00:00:00 2001
From: Eric Naim <dnaim@cachyos.org>
Date: Fri, 15 Nov 2024 15:22:08 +0800
Subject: [PATCH] le9uo
Signed-off-by: Eric Naim <dnaim@cachyos.org>
---
Documentation/admin-guide/sysctl/vm.rst | 72 ++++++++++++
include/linux/mm.h | 8 ++
kernel/sysctl.c | 34 ++++++
mm/Kconfig | 63 +++++++++++
mm/mm_init.c | 1 +
mm/vmscan.c | 143 +++++++++++++++++++++++-
6 files changed, 317 insertions(+), 4 deletions(-)
diff --git a/Documentation/admin-guide/sysctl/vm.rst b/Documentation/admin-guide/sysctl/vm.rst
index f48eaa98d22d..fc777c14cff6 100644
--- a/Documentation/admin-guide/sysctl/vm.rst
+++ b/Documentation/admin-guide/sysctl/vm.rst
@@ -25,6 +25,9 @@ files can be found in mm/swap.c.
Currently, these files are in /proc/sys/vm:
- admin_reserve_kbytes
+- anon_min_ratio
+- clean_low_ratio
+- clean_min_ratio
- compact_memory
- compaction_proactiveness
- compact_unevictable_allowed
@@ -108,6 +111,67 @@ On x86_64 this is about 128MB.
Changing this takes effect whenever an application requests memory.
+anon_min_ratio
+==============
+
+This knob provides *hard* protection of anonymous pages. The anonymous pages
+on the current node won't be reclaimed under any conditions when their amount
+is below vm.anon_min_ratio.
+
+This knob may be used to prevent excessive swap thrashing when anonymous
+memory is low (for example, when memory is going to be overfilled by
+compressed data of zram module).
+
+Setting this value too high (close to 100) can result in inability to
+swap and can lead to early OOM under memory pressure.
+
+The unit of measurement is the percentage of the total memory of the node.
+
+The default value is 15.
+
+
+clean_low_ratio
+================
+
+This knob provides *best-effort* protection of clean file pages. The file pages
+on the current node won't be reclaimed under memory pressure when the amount of
+clean file pages is below vm.clean_low_ratio *unless* we threaten to OOM.
+
+Protection of clean file pages using this knob may be used when swapping is
+still possible to
+ - prevent disk I/O thrashing under memory pressure;
+ - improve performance in disk cache-bound tasks under memory pressure.
+
+Setting it to a high value may result in a early eviction of anonymous pages
+into the swap space by attempting to hold the protected amount of clean file
+pages in memory.
+
+The unit of measurement is the percentage of the total memory of the node.
+
+The default value is 0.
+
+
+clean_min_ratio
+================
+
+This knob provides *hard* protection of clean file pages. The file pages on the
+current node won't be reclaimed under memory pressure when the amount of clean
+file pages is below vm.clean_min_ratio.
+
+Hard protection of clean file pages using this knob may be used to
+ - prevent disk I/O thrashing under memory pressure even with no free swap space;
+ - improve performance in disk cache-bound tasks under memory pressure;
+ - avoid high latency and prevent livelock in near-OOM conditions.
+
+Setting it to a high value may result in a early out-of-memory condition due to
+the inability to reclaim the protected amount of clean file pages when other
+types of pages cannot be reclaimed.
+
+The unit of measurement is the percentage of the total memory of the node.
+
+The default value is 15.
+
+
compact_memory
==============
@@ -964,6 +1028,14 @@ be 133 (x + 2x = 200, 2x = 133.33).
At 0, the kernel will not initiate swap until the amount of free and
file-backed pages is less than the high watermark in a zone.
+This knob has no effect if the amount of clean file pages on the current
+node is below vm.clean_low_ratio or vm.clean_min_ratio. In this case,
+only anonymous pages can be reclaimed.
+
+If the number of anonymous pages on the current node is below
+vm.anon_min_ratio, then only file pages can be reclaimed with
+any vm.swappiness value.
+
unprivileged_userfaultfd
========================
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 61fff5d34ed5..18dc2544700b 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -205,6 +205,14 @@ static inline void __mm_zero_struct_page(struct page *page)
extern int sysctl_max_map_count;
+extern bool sysctl_workingset_protection;
+extern u8 sysctl_anon_min_ratio;
+extern u8 sysctl_clean_low_ratio;
+extern u8 sysctl_clean_min_ratio;
+int vm_workingset_protection_update_handler(
+ const struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+
extern unsigned long sysctl_user_reserve_kbytes;
extern unsigned long sysctl_admin_reserve_kbytes;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 676e89dc38c3..4a62ae02a2c0 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2210,6 +2210,40 @@ static struct ctl_table vm_table[] = {
.extra1 = SYSCTL_ZERO,
},
#endif
+ {
+ .procname = "workingset_protection",
+ .data = &sysctl_workingset_protection,
+ .maxlen = sizeof(bool),
+ .mode = 0644,
+ .proc_handler = &proc_dobool,
+ },
+ {
+ .procname = "anon_min_ratio",
+ .data = &sysctl_anon_min_ratio,
+ .maxlen = sizeof(u8),
+ .mode = 0644,
+ .proc_handler = &vm_workingset_protection_update_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "clean_low_ratio",
+ .data = &sysctl_clean_low_ratio,
+ .maxlen = sizeof(u8),
+ .mode = 0644,
+ .proc_handler = &vm_workingset_protection_update_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
+ {
+ .procname = "clean_min_ratio",
+ .data = &sysctl_clean_min_ratio,
+ .maxlen = sizeof(u8),
+ .mode = 0644,
+ .proc_handler = &vm_workingset_protection_update_handler,
+ .extra1 = SYSCTL_ZERO,
+ .extra2 = SYSCTL_ONE_HUNDRED,
+ },
{
.procname = "user_reserve_kbytes",
.data = &sysctl_user_reserve_kbytes,
diff --git a/mm/Kconfig b/mm/Kconfig
index 6bfea371341e..87cb63f7ca57 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -499,6 +499,69 @@ config ARCH_WANT_OPTIMIZE_DAX_VMEMMAP
config ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
bool
+config ANON_MIN_RATIO
+ int "Default value for vm.anon_min_ratio"
+ depends on SYSCTL
+ range 0 100
+ default 15
+ help
+ This option sets the default value for vm.anon_min_ratio sysctl knob.
+
+ The vm.anon_min_ratio sysctl knob provides *hard* protection of
+ anonymous pages. The anonymous pages on the current node won't be
+ reclaimed under any conditions when their amount is below
+ vm.anon_min_ratio. This knob may be used to prevent excessive swap
+ thrashing when anonymous memory is low (for example, when memory is
+ going to be overfilled by compressed data of zram module).
+
+ Setting this value too high (close to MemTotal) can result in
+ inability to swap and can lead to early OOM under memory pressure.
+
+config CLEAN_LOW_RATIO
+ int "Default value for vm.clean_low_ratio"
+ depends on SYSCTL
+ range 0 100
+ default 0
+ help
+ This option sets the default value for vm.clean_low_ratio sysctl knob.
+
+ The vm.clean_low_ratio sysctl knob provides *best-effort*
+ protection of clean file pages. The file pages on the current node
+ won't be reclaimed under memory pressure when the amount of clean file
+ pages is below vm.clean_low_ratio *unless* we threaten to OOM.
+ Protection of clean file pages using this knob may be used when
+ swapping is still possible to
+ - prevent disk I/O thrashing under memory pressure;
+ - improve performance in disk cache-bound tasks under memory
+ pressure.
+
+ Setting it to a high value may result in a early eviction of anonymous
+ pages into the swap space by attempting to hold the protected amount
+ of clean file pages in memory.
+
+config CLEAN_MIN_RATIO
+ int "Default value for vm.clean_min_ratio"
+ depends on SYSCTL
+ range 0 100
+ default 15
+ help
+ This option sets the default value for vm.clean_min_ratio sysctl knob.
+
+ The vm.clean_min_ratio sysctl knob provides *hard* protection of
+ clean file pages. The file pages on the current node won't be
+ reclaimed under memory pressure when the amount of clean file pages is
+ below vm.clean_min_ratio. Hard protection of clean file pages using
+ this knob may be used to
+ - prevent disk I/O thrashing under memory pressure even with no free
+ swap space;
+ - improve performance in disk cache-bound tasks under memory
+ pressure;
+ - avoid high latency and prevent livelock in near-OOM conditions.
+
+ Setting it to a high value may result in a early out-of-memory condition
+ due to the inability to reclaim the protected amount of clean file pages
+ when other types of pages cannot be reclaimed.
+
config HAVE_MEMBLOCK_PHYS_MAP
bool
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 4ba5607aaf19..0a83f8973ddf 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -2628,6 +2628,7 @@ static void __init mem_init_print_info(void)
, K(totalhigh_pages())
#endif
);
+ printk(KERN_INFO "le9 Unofficial (le9uo) working set protection 1.7 by Masahito Suzuki (forked from hakavlad's original le9 patch)");
}
/*
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 99568ccfb0fd..af10b7d3407a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -148,6 +148,15 @@ struct scan_control {
/* The file folios on the current node are dangerously low */
unsigned int file_is_tiny:1;
+ /* The anonymous pages on the current node are below vm.anon_min_ratio */
+ unsigned int anon_below_min:1;
+
+ /* The clean file pages on the current node are below vm.clean_low_ratio */
+ unsigned int clean_below_low:1;
+
+ /* The clean file pages on the current node are below vm.clean_min_ratio */
+ unsigned int clean_below_min:1;
+
/* Always discard instead of demoting to lower tier memory */
unsigned int no_demotion:1;
@@ -197,6 +206,15 @@ struct scan_control {
#define prefetchw_prev_lru_folio(_folio, _base, _field) do { } while (0)
#endif
+bool sysctl_workingset_protection __read_mostly = true;
+u8 sysctl_anon_min_ratio __read_mostly = CONFIG_ANON_MIN_RATIO;
+u8 sysctl_clean_low_ratio __read_mostly = CONFIG_CLEAN_LOW_RATIO;
+u8 sysctl_clean_min_ratio __read_mostly = CONFIG_CLEAN_MIN_RATIO;
+static u64 sysctl_anon_min_ratio_kb __read_mostly = 0;
+static u64 sysctl_clean_low_ratio_kb __read_mostly = 0;
+static u64 sysctl_clean_min_ratio_kb __read_mostly = 0;
+static u64 workingset_protection_prev_totalram __read_mostly = 0;
+
/*
* From 0 .. MAX_SWAPPINESS. Higher means more swappy.
*/
@@ -1094,6 +1112,10 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
folio_mapped(folio) && folio_test_referenced(folio))
goto keep_locked;
+ if (folio_is_file_lru(folio) ? sc->clean_below_min :
+ (sc->anon_below_min && !sc->clean_below_min))
+ goto keep_locked;
+
/*
* The number of dirty pages determines if a node is marked
* reclaim_congested. kswapd will stall and start writing
@@ -2419,6 +2441,15 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
goto out;
}
+ /*
+ * Force-scan anon if clean file pages is under vm.clean_low_ratio
+ * or vm.clean_min_ratio.
+ */
+ if (sc->clean_below_low || sc->clean_below_min) {
+ scan_balance = SCAN_ANON;
+ goto out;
+ }
+
/*
* If there is enough inactive page cache, we do not reclaim
* anything from the anonymous working right now.
@@ -2563,6 +2594,14 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc,
BUG();
}
+ /*
+ * Hard protection of the working set.
+ * Don't reclaim anon/file pages when the amount is
+ * below the watermark of the same type.
+ */
+ if (file ? sc->clean_below_min : sc->anon_below_min)
+ scan = 0;
+
nr[lru] = scan;
}
}
@@ -3996,11 +4035,7 @@ static bool lruvec_is_reclaimable(struct lruvec *lruvec, struct scan_control *sc
}
/* to protect the working set of the last N jiffies */
-#ifdef CONFIG_CACHY
-static unsigned long lru_gen_min_ttl __read_mostly = 1000;
-#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)
{
@@ -4038,6 +4073,96 @@ static void lru_gen_age_node(struct pglist_data *pgdat, struct scan_control *sc)
}
}
+int vm_workingset_protection_update_handler(const struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
+ if (ret || !write)
+ return ret;
+
+ workingset_protection_prev_totalram = 0;
+
+ return 0;
+}
+
+static void prepare_workingset_protection(pg_data_t *pgdat, struct scan_control *sc)
+{
+ unsigned long node_mem_total;
+ struct sysinfo i;
+
+ if (!(sysctl_workingset_protection)) {
+ sc->anon_below_min = 0;
+ sc->clean_below_low = 0;
+ sc->clean_below_min = 0;
+ return;
+ }
+
+ if (likely(sysctl_anon_min_ratio ||
+ sysctl_clean_low_ratio ||
+ sysctl_clean_min_ratio)) {
+#ifdef CONFIG_NUMA
+ si_meminfo_node(&i, pgdat->node_id);
+#else //CONFIG_NUMA
+ si_meminfo(&i);
+#endif //CONFIG_NUMA
+ node_mem_total = i.totalram;
+
+ if (unlikely(workingset_protection_prev_totalram != node_mem_total)) {
+ sysctl_anon_min_ratio_kb =
+ node_mem_total * sysctl_anon_min_ratio / 100;
+ sysctl_clean_low_ratio_kb =
+ node_mem_total * sysctl_clean_low_ratio / 100;
+ sysctl_clean_min_ratio_kb =
+ node_mem_total * sysctl_clean_min_ratio / 100;
+ workingset_protection_prev_totalram = node_mem_total;
+ }
+ }
+
+ /*
+ * Check the number of anonymous pages to protect them from
+ * reclaiming if their amount is below the specified.
+ */
+ if (sysctl_anon_min_ratio) {
+ unsigned long reclaimable_anon;
+
+ reclaimable_anon =
+ node_page_state(pgdat, NR_ACTIVE_ANON) +
+ node_page_state(pgdat, NR_INACTIVE_ANON) +
+ node_page_state(pgdat, NR_ISOLATED_ANON);
+
+ sc->anon_below_min = reclaimable_anon < sysctl_anon_min_ratio_kb;
+ } else
+ sc->anon_below_min = 0;
+
+ /*
+ * Check the number of clean file pages to protect them from
+ * reclaiming if their amount is below the specified.
+ */
+ if (sysctl_clean_low_ratio || sysctl_clean_min_ratio) {
+ unsigned long reclaimable_file, dirty, clean;
+
+ reclaimable_file =
+ node_page_state(pgdat, NR_ACTIVE_FILE) +
+ node_page_state(pgdat, NR_INACTIVE_FILE) +
+ node_page_state(pgdat, NR_ISOLATED_FILE);
+ dirty = node_page_state(pgdat, NR_FILE_DIRTY);
+ /*
+ * node_page_state() sum can go out of sync since
+ * all the values are not read at once.
+ */
+ if (likely(reclaimable_file > dirty))
+ clean = reclaimable_file - dirty;
+ else
+ clean = 0;
+
+ sc->clean_below_low = clean < sysctl_clean_low_ratio_kb;
+ sc->clean_below_min = clean < sysctl_clean_min_ratio_kb;
+ } else {
+ sc->clean_below_low = 0;
+ sc->clean_below_min = 0;
+ }
+}
+
/******************************************************************************
* rmap/PT walk feedback
******************************************************************************/
@@ -4536,6 +4661,12 @@ static int isolate_folios(struct lruvec *lruvec, struct scan_control *sc, int sw
*/
if (!swappiness)
type = LRU_GEN_FILE;
+ else if (sc->clean_below_min)
+ type = LRU_GEN_ANON;
+ else if (sc->anon_below_min)
+ type = LRU_GEN_FILE;
+ else if (sc->clean_below_low)
+ type = LRU_GEN_ANON;
else if (min_seq[LRU_GEN_ANON] < min_seq[LRU_GEN_FILE])
type = LRU_GEN_ANON;
else if (swappiness == 1)
@@ -4815,6 +4946,8 @@ static int shrink_one(struct lruvec *lruvec, struct scan_control *sc)
struct mem_cgroup *memcg = lruvec_memcg(lruvec);
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
+ prepare_workingset_protection(pgdat, sc);
+
/* lru_gen_age_node() called mem_cgroup_calculate_protection() */
if (mem_cgroup_below_min(NULL, memcg))
return MEMCG_LRU_YOUNG;
@@ -5962,6 +6095,8 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc)
prepare_scan_control(pgdat, sc);
+ prepare_workingset_protection(pgdat, sc);
+
shrink_node_memcgs(pgdat, sc);
flush_reclaim_state(sc);
--
2.47.0