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SubjectRe: [PATCH 1/4] mm/vmalloc: allow to call vfree() in atomic context
On Thu 30-03-17 17:48:39, Andrey Ryabinin wrote:
> From: Andrey Ryabinin <aryabinin@virtuozzo.com>
> Subject: mm/vmalloc: allow to call vfree() in atomic context fix
>
> Don't spawn worker if we already purging.
>
> Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>

I would rather put this into a separate patch. Ideally with some numners
as this is an optimization...

> ---
> mm/vmalloc.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index ea1b4ab..88168b8 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -737,7 +737,8 @@ static void free_vmap_area_noflush(struct vmap_area *va)
> /* After this point, we may free va at any time */
> llist_add(&va->purge_list, &vmap_purge_list);
>
> - if (unlikely(nr_lazy > lazy_max_pages()))
> + if (unlikely(nr_lazy > lazy_max_pages()) &&
> + !mutex_is_locked(&vmap_purge_lock))
> schedule_work(&purge_vmap_work);
> }
>
> --
> 2.10.2
>

--
Michal Hocko
SUSE Labs

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