linux-kernel - Re: [PATCH 24/94] radix tree test suite: Add keme_cache_alloc

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Date:   Fri, 28 May 2021 11:17:39 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>
Subject: Re: [PATCH 24/94] radix tree test suite: Add keme_cache_alloc_bulk() support

On Wed, Apr 28, 2021 at 8:36 AM Liam Howlett <liam.howlett@...cle.com> wrote:
>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
> ---
>  tools/testing/radix-tree/linux.c      | 51 +++++++++++++++++++++++++++
>  tools/testing/radix-tree/linux/slab.h |  1 +
>  2 files changed, 52 insertions(+)
>
> diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
> index 380bbc0a48d6..fb19a40ebb46 100644
> --- a/tools/testing/radix-tree/linux.c
> +++ b/tools/testing/radix-tree/linux.c
> @@ -99,6 +99,57 @@ void kmem_cache_free_bulk(struct kmem_cache *cachep, size_t size, void **list)
>         for (int i = 0; i < size; i++)
>                 kmem_cache_free(cachep, list[i]);
>  }
> +int kmem_cache_alloc_bulk(struct kmem_cache *cachep, gfp_t gfp, size_t size,
> +                         void **p)
> +{
> +       size_t i;
> +
> +       if (kmalloc_verbose)
> +               printk("Bulk alloc %lu\n", size);
> +
> +       if (!(gfp & __GFP_DIRECT_RECLAIM) && cachep->non_kernel < size)
> +               return 0;
> +
> +       if (!(gfp & __GFP_DIRECT_RECLAIM))
> +               cachep->non_kernel -= size;
> +
> +       pthread_mutex_lock(&cachep->lock);
> +       if (cachep->nr_objs >= size) {
> +               struct radix_tree_node *node = cachep->objs;
> +

I don't think the loop below is correct because "node" is not being
changed on each iteration:

> +               for (i = 0; i < size; i++) {
> +                       cachep->nr_objs--;
> +                       cachep->objs = node->parent;

In the above assignment cachep->objs will be assigned the same value
on all iterations.

> +                       p[i] = cachep->objs;

p[0] should point to the node, however here it would point to the node->parent.

> +               }
> +               pthread_mutex_unlock(&cachep->lock);
> +               node->parent = NULL;

here you terminated the original cachep->objs which is not even inside
the "p" list at this point (it was skipped).

> +       } else {
> +               pthread_mutex_unlock(&cachep->lock);
> +               for (i = 0; i < size; i++) {
> +                       if (cachep->align) {
> +                               posix_memalign(&p[i], cachep->align,
> +                                              cachep->size * size);
> +                       } else {
> +                               p[i] = malloc(cachep->size * size);
> +                       }
> +                       if (cachep->ctor)
> +                               cachep->ctor(p[i]);
> +                       else if (gfp & __GFP_ZERO)
> +                               memset(p[i], 0, cachep->size);
> +               }
> +       }
> +
> +       for (i = 0; i < size; i++) {
> +               uatomic_inc(&nr_allocated);
> +               uatomic_inc(&nr_tallocated);

I don't see nr_tallocated even in linux-next branch. Was it introduced
in one of the previous patches and I missed it?

> +               if (kmalloc_verbose)
> +                       printf("Allocating %p from slab\n", p[i]);
> +       }
> +
> +       return size;
> +}
> +
>
>  void *kmalloc(size_t size, gfp_t gfp)
>  {
> diff --git a/tools/testing/radix-tree/linux/slab.h b/tools/testing/radix-tree/linux/slab.h
> index 53b79c15b3a2..ba42b8cc11d0 100644
> --- a/tools/testing/radix-tree/linux/slab.h
> +++ b/tools/testing/radix-tree/linux/slab.h
> @@ -25,4 +25,5 @@ struct kmem_cache *kmem_cache_create(const char *name, unsigned int size,
>                         void (*ctor)(void *));
>
>  void kmem_cache_free_bulk(struct kmem_cache *cachep, size_t, void **);
> +int kmem_cache_alloc_bulk(struct kmem_cache *cachep, gfp_t, size_t, void **);
>  #endif         /* SLAB_H */
> --
> 2.30.2