mm: list_lru: fix almost infinite loop causing effective livelock
I've seen a fair number of issues with kswapd and other processes appearing to get stuck in v3.12-rc. Using sysrq-p many times seems to indicate that it gets stuck somewhere in list_lru_walk_node(), called from prune_icache_sb() and super_cache_scan(). I never seem to be able to trigger a calltrace for functions above that point. So I decided to add the following to super_cache_scan(): @@ -81,10 +81,14 @@ static unsigned long super_cache_scan(struct shrinker *shrink, inodes = list_lru_count_node(&sb->s_inode_lru, sc->nid); dentries = list_lru_count_node(&sb->s_dentry_lru, sc->nid); total_objects = dentries + inodes + fs_objects + 1; +printk("%s:%u: %s: dentries %lu inodes %lu total %lu\n", current->comm, current->pid, __func__, dentries, inodes, total_objects); /* proportion the scan between the caches */ dentries = mult_frac(sc->nr_to_scan, dentries, total_objects); ...
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