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If we failed to read /proc/meminfo, just run the shrinkers.

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This commit is contained in:
Kent Overstreet 2021-03-31 12:50:09 -04:00
parent 40e14938ee
commit 98844616f6
1 changed files with 12 additions and 5 deletions
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17
linux/shrinker.c
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@ -28,7 +28,6 @@ void unregister_shrinker(struct shrinker *shrinker)
struct meminfo {
u64 total;
u64 available;
};
static u64 parse_meminfo_line(const char *line)
@ -50,7 +49,7 @@ static struct meminfo read_meminfo(void)
f = fopen("/proc/meminfo", "r");
if (!f)
die("error opening /proc/meminfo: %m");
return ret;
while ((len = getline(&line, &n, f)) != -1) {
if ((v = strcmp_prefix(line, "MemTotal:")))
@ -77,10 +76,18 @@ void run_shrinkers(void)
return;
info = read_meminfo();
want_shrink = (info.total >> 2) - info.available;
if (want_shrink <= 0)
return;
if (info.total && info.available) {
want_shrink = (info.total >> 2) - info.available;
if (want_shrink <= 0)
return;
} else {
/* If we weren't able to read /proc/meminfo, we must be pretty
* low: */
want_shrink = 8 << 20;
}
mutex_lock(&shrinker_lock);
list_for_each_entry(shrinker, &shrinker_list, list) {