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Groups > linux.kernel > #1732842
| From | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 3/3] mm: oom: show unreclaimable slab info when kernel panic |
| Date | 2017-09-15 14:10 +0200 |
| Message-ID | <upXBv-2BE-7@gated-at.bofh.it> (permalink) |
| References | <upFXY-7Vl-5@gated-at.bofh.it> <upFXY-7Vl-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 2017/09/15 2:14, Yang Shi wrote:
> @@ -1274,6 +1276,29 @@ static int slab_show(struct seq_file *m, void *p)
> return 0;
> }
>
> +void show_unreclaimable_slab()
> +{
> + struct kmem_cache *s = NULL;
> + struct slabinfo sinfo;
> +
> + memset(&sinfo, 0, sizeof(sinfo));
> +
> + printk("Unreclaimable slabs:\n");
> + mutex_lock(&slab_mutex);
Please avoid sleeping locks which potentially depend on memory allocation.
There are
mutex_lock(&slab_mutex);
kmalloc(GFP_KERNEL);
mutex_unlock(&slab_mutex);
users which will fail to call panic() if they hit this path.
> + list_for_each_entry(s, &slab_caches, list) {
> + if (!is_root_cache(s))
> + continue;
> +
> + get_slabinfo(s, &sinfo);
> +
> + if (!is_reclaimable(s) && sinfo.num_objs > 0)
> + printk("%-17s %luKB\n", cache_name(s), K(sinfo.num_objs * s->size));
> + }
> + mutex_unlock(&slab_mutex);
> +}
> +EXPORT_SYMBOL(show_unreclaimable_slab);
> +#undef K
> +
> #if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
> void *memcg_slab_start(struct seq_file *m, loff_t *pos)
> {
>
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[PATCH 3/3] mm: oom: show unreclaimable slab info when kernel panic "Yang Shi" <yang.s@alibaba-inc.com> - 2017-09-14 19:20 +0200
Re: [PATCH 3/3] mm: oom: show unreclaimable slab info when kernel panic Christopher Lameter <cl@linux.com> - 2017-09-14 19:40 +0200
Re: [PATCH 3/3] mm: oom: show unreclaimable slab info when kernel panic "Yang Shi" <yang.s@alibaba-inc.com> - 2017-09-14 19:50 +0200
Re: [PATCH 3/3] mm: oom: show unreclaimable slab info when kernel panic Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2017-09-15 14:10 +0200
Re: [PATCH 3/3] mm: oom: show unreclaimable slab info when kernel panic "Yang Shi" <yang.s@alibaba-inc.com> - 2017-09-15 19:50 +0200
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