From d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:45:28 +0000
Subject: [PATCH] add boot partition size
---
kernel/mm/page_counter.c | 38 +++++++++++++++++---------------------
1 files changed, 17 insertions(+), 21 deletions(-)
diff --git a/kernel/mm/page_counter.c b/kernel/mm/page_counter.c
index 147ff99..b24a60b 100644
--- a/kernel/mm/page_counter.c
+++ b/kernel/mm/page_counter.c
@@ -17,29 +17,24 @@
unsigned long usage)
{
unsigned long protected, old_protected;
+ unsigned long low, min;
long delta;
if (!c->parent)
return;
- if (c->min || atomic_long_read(&c->min_usage)) {
- if (usage <= c->min)
- protected = usage;
- else
- protected = 0;
-
+ min = READ_ONCE(c->min);
+ if (min || atomic_long_read(&c->min_usage)) {
+ protected = min(usage, min);
old_protected = atomic_long_xchg(&c->min_usage, protected);
delta = protected - old_protected;
if (delta)
atomic_long_add(delta, &c->parent->children_min_usage);
}
- if (c->low || atomic_long_read(&c->low_usage)) {
- if (usage <= c->low)
- protected = usage;
- else
- protected = 0;
-
+ low = READ_ONCE(c->low);
+ if (low || atomic_long_read(&c->low_usage)) {
+ protected = min(usage, low);
old_protected = atomic_long_xchg(&c->low_usage, protected);
delta = protected - old_protected;
if (delta)
@@ -82,8 +77,8 @@
* This is indeed racy, but we can live with some
* inaccuracy in the watermark.
*/
- if (new > c->watermark)
- c->watermark = new;
+ if (new > READ_ONCE(c->watermark))
+ WRITE_ONCE(c->watermark, new);
}
}
@@ -114,7 +109,7 @@
*
* The atomic_long_add_return() implies a full memory
* barrier between incrementing the count and reading
- * the limit. When racing with page_counter_limit(),
+ * the limit. When racing with page_counter_set_max(),
* we either see the new limit or the setter sees the
* counter has changed and retries.
*/
@@ -124,9 +119,10 @@
propagate_protected_usage(c, new);
/*
* This is racy, but we can live with some
- * inaccuracy in the failcnt.
+ * inaccuracy in the failcnt which is only used
+ * to report stats.
*/
- c->failcnt++;
+ data_race(c->failcnt++);
*fail = c;
goto failed;
}
@@ -135,8 +131,8 @@
* Just like with failcnt, we can live with some
* inaccuracy in the watermark.
*/
- if (new > c->watermark)
- c->watermark = new;
+ if (new > READ_ONCE(c->watermark))
+ WRITE_ONCE(c->watermark, new);
}
return true;
@@ -213,7 +209,7 @@
{
struct page_counter *c;
- counter->min = nr_pages;
+ WRITE_ONCE(counter->min, nr_pages);
for (c = counter; c; c = c->parent)
propagate_protected_usage(c, atomic_long_read(&c->usage));
@@ -230,7 +226,7 @@
{
struct page_counter *c;
- counter->low = nr_pages;
+ WRITE_ONCE(counter->low, nr_pages);
for (c = counter; c; c = c->parent)
propagate_protected_usage(c, atomic_long_read(&c->usage));
--
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