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Wed, 09 Jun 2021 11:39:31 +0000 From: Vlastimil Babka To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Lameter , David Rientjes , Pekka Enberg , Joonsoo Kim Cc: Sebastian Andrzej Siewior , Thomas Gleixner , Mel Gorman , Jesper Dangaard Brouer , Peter Zijlstra , Jann Horn , Vlastimil Babka Subject: [RFC v2 03/34] mm, slub: allocate private object map for validate_slab_cache() Date: Wed, 9 Jun 2021 13:38:32 +0200 Message-Id: <20210609113903.1421-4-vbabka@suse.cz> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609113903.1421-1-vbabka@suse.cz> References: <20210609113903.1421-1-vbabka@suse.cz> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 7E487C00CBFC X-Stat-Signature: 1ax3c94u8i4jun9qwru3h9n116htzioj Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=R7fnjYim; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=oWylKST4; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=R7fnjYim; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b=oWylKST4; dmarc=none; spf=pass (imf06.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz X-HE-Tag: 1623238769-639730 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: validate_slab_cache() is called either to handle a sysfs write, or from a self-test context. In both situations it's straightforward to preallocate= a private object bitmap instead of grabbing the shared static one meant for critical sections, so let's do that. Signed-off-by: Vlastimil Babka Acked-by: Christoph Lameter Acked-by: Mel Gorman --- mm/slub.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 92c3ab3a95ba..5a940bd3cebb 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4622,11 +4622,11 @@ static int count_total(struct page *page) #endif =20 #ifdef CONFIG_SLUB_DEBUG -static void validate_slab(struct kmem_cache *s, struct page *page) +static void validate_slab(struct kmem_cache *s, struct page *page, + unsigned long *obj_map) { void *p; void *addr =3D page_address(page); - unsigned long *map; =20 slab_lock(page); =20 @@ -4634,21 +4634,20 @@ static void validate_slab(struct kmem_cache *s, s= truct page *page) goto unlock; =20 /* Now we know that a valid freelist exists */ - map =3D get_map(s, page); + __fill_map(obj_map, s, page); for_each_object(p, s, addr, page->objects) { - u8 val =3D test_bit(__obj_to_index(s, addr, p), map) ? + u8 val =3D test_bit(__obj_to_index(s, addr, p), obj_map) ? SLUB_RED_INACTIVE : SLUB_RED_ACTIVE; =20 if (!check_object(s, page, p, val)) break; } - put_map(map); unlock: slab_unlock(page); } =20 static int validate_slab_node(struct kmem_cache *s, - struct kmem_cache_node *n) + struct kmem_cache_node *n, unsigned long *obj_map) { unsigned long count =3D 0; struct page *page; @@ -4657,7 +4656,7 @@ static int validate_slab_node(struct kmem_cache *s, spin_lock_irqsave(&n->list_lock, flags); =20 list_for_each_entry(page, &n->partial, slab_list) { - validate_slab(s, page); + validate_slab(s, page, obj_map); count++; } if (count !=3D n->nr_partial) @@ -4668,7 +4667,7 @@ static int validate_slab_node(struct kmem_cache *s, goto out; =20 list_for_each_entry(page, &n->full, slab_list) { - validate_slab(s, page); + validate_slab(s, page, obj_map); count++; } if (count !=3D atomic_long_read(&n->nr_slabs)) @@ -4685,10 +4684,17 @@ static long validate_slab_cache(struct kmem_cache= *s) int node; unsigned long count =3D 0; struct kmem_cache_node *n; + unsigned long *obj_map; + + obj_map =3D bitmap_alloc(oo_objects(s->oo), GFP_KERNEL); + if (!obj_map) + return -ENOMEM; =20 flush_all(s); for_each_kmem_cache_node(s, node, n) - count +=3D validate_slab_node(s, n); + count +=3D validate_slab_node(s, n, obj_map); + + bitmap_free(obj_map); =20 return count; } --=20 2.31.1