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From:   Pengfei Li <lpf.vector@gmail.com>
To:     akpm@linux-foundation.org
Cc:     vbabka@suse.cz, cl@linux.com, penberg@kernel.org,
        rientjes@google.com, iamjoonsoo.kim@lge.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, guro@fb.com,
        Pengfei Li <lpf.vector@gmail.com>
Subject: [PATCH v4 7/7] mm, slab_common: Modify kmalloc_caches[type][idx] to kmalloc_caches[idx][type]
Date:   Mon, 16 Sep 2019 00:51:21 +0800
Message-Id: <20190915165121.7237-13-lpf.vector@gmail.com>
In-Reply-To: <20190915165121.7237-1-lpf.vector@gmail.com>
References: <20190915165121.7237-1-lpf.vector@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

KMALLOC_NORMAL is the most frequently accessed, and kmalloc_caches[]
is initialized by different types of the same size.

So modifying kmalloc_caches[type][idx] to kmalloc_caches[idx][type]
will benefit performance.

$ ./scripts/bloat-o-meter vmlinux.patch_1-6 vmlinux.patch_1-7
add/remove: 0/0 grow/shrink: 2/57 up/down: 8/-457 (-449)
Function                                     old     new   delta
tg3_self_test                               4255    4259      +4
nf_queue                                     666     670      +4
kmalloc_slab                                  97      93      -4
i915_sw_fence_await_dma_fence                441     437      -4
__igmp_group_dropped                         619     615      -4
gss_import_sec_context                       176     170      -6
xhci_alloc_command                           212     205      -7
create_kmalloc_caches                        155     148      -7
xprt_switch_alloc                            136     128      -8
xhci_segment_alloc                           297     289      -8
xhci_ring_alloc                              369     361      -8
xhci_mem_init                               3664    3656      -8
xhci_alloc_virt_device                       496     488      -8
xhci_alloc_tt_info                           346     338      -8
xhci_alloc_stream_info                       718     710      -8
xhci_alloc_container_ctx                     215     207      -8
xfrm_policy_alloc                            271     263      -8
tcp_sendmsg_locked                          3120    3112      -8
tcp_md5_do_add                               774     766      -8
tcp_fastopen_defer_connect                   270     262      -8
sr_read_tochdr.isra                          251     243      -8
sr_read_tocentry.isra                        328     320      -8
sr_is_xa                                     376     368      -8
sr_get_mcn                                   260     252      -8
selinux_sk_alloc_security                    113     105      -8
sdev_evt_send_simple                         118     110      -8
sdev_evt_alloc                                79      71      -8
scsi_probe_and_add_lun                      2938    2930      -8
sbitmap_queue_init_node                      418     410      -8
ring_buffer_read_prepare                      94      86      -8
request_firmware_nowait                      396     388      -8
regulatory_hint_found_beacon                 394     386      -8
ohci_urb_enqueue                            3176    3168      -8
nla_strdup                                   142     134      -8
nfs_alloc_seqid                               87      79      -8
nfs4_get_state_owner                        1040    1032      -8
nfs4_do_close                                578     570      -8
nf_ct_tmpl_alloc                              85      77      -8
mempool_create_node                          164     156      -8
ip_setup_cork                                362     354      -8
ip6_setup_cork                              1021    1013      -8
gss_create_cred                              140     132      -8
drm_flip_work_allocate_task                   70      62      -8
dma_pool_alloc                               410     402      -8
devres_open_group                            214     206      -8
cfg80211_stop_iface                          260     252      -8
cfg80211_sinfo_alloc_tid_stats                77      69      -8
cfg80211_port_authorized                     212     204      -8
cfg80211_parse_mbssid_data                  2397    2389      -8
cfg80211_ibss_joined                         335     327      -8
call_usermodehelper_setup                    149     141      -8
bpf_prog_alloc_no_stats                      182     174      -8
blk_alloc_flush_queue                        191     183      -8
bdi_alloc_node                               195     187      -8
audit_log_d_path                             196     188      -8
_netlbl_catmap_getnode                       247     239      -8
____ip_mc_inc_group                          475     467      -8
__i915_sw_fence_await_sw_fence               417     405     -12
ida_alloc_range                              955     934     -21
Total: Before=14874316, After=14873867, chg -0.00%

Signed-off-by: Pengfei Li <lpf.vector@gmail.com>
---
 include/linux/slab.h |  6 +++---
 mm/slab.c            |  4 ++--
 mm/slab_common.c     |  8 ++++----
 mm/slub.c            | 12 ++++++------
 4 files changed, 15 insertions(+), 15 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index f53bb6980110..0842db5f7053 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -340,7 +340,7 @@ enum kmalloc_cache_type {
 
 #ifndef CONFIG_SLOB
 extern struct kmem_cache *
-kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_CACHE_NUM];
+kmalloc_caches[KMALLOC_CACHE_NUM][NR_KMALLOC_TYPES];
 
 static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags)
 {
@@ -582,7 +582,7 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
 			return ZERO_SIZE_PTR;
 
 		return kmem_cache_alloc_trace(
-				kmalloc_caches[kmalloc_type(flags)][index],
+				kmalloc_caches[index][kmalloc_type(flags)],
 				flags, size);
 #endif
 	}
@@ -600,7 +600,7 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
 			return ZERO_SIZE_PTR;
 
 		return kmem_cache_alloc_node_trace(
-				kmalloc_caches[kmalloc_type(flags)][i],
+				kmalloc_caches[i][kmalloc_type(flags)],
 						flags, node, size);
 	}
 #endif
diff --git a/mm/slab.c b/mm/slab.c
index 7bc4e90e1147..079c3e6ced1f 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1246,7 +1246,7 @@ void __init kmem_cache_init(void)
 	 * Initialize the caches that provide memory for the  kmem_cache_node
 	 * structures first.  Without this, further allocations will bug.
 	 */
-	kmalloc_caches[KMALLOC_NORMAL][INDEX_NODE] = create_kmalloc_cache(
+	kmalloc_caches[INDEX_NODE][KMALLOC_NORMAL] = create_kmalloc_cache(
 				kmalloc_info[INDEX_NODE].name[KMALLOC_NORMAL],
 				kmalloc_info[INDEX_NODE].size,
 				ARCH_KMALLOC_FLAGS, 0,
@@ -1263,7 +1263,7 @@ void __init kmem_cache_init(void)
 		for_each_online_node(nid) {
 			init_list(kmem_cache, &init_kmem_cache_node[CACHE_CACHE + nid], nid);
 
-			init_list(kmalloc_caches[KMALLOC_NORMAL][INDEX_NODE],
+			init_list(kmalloc_caches[INDEX_NODE][KMALLOC_NORMAL],
 					  &init_kmem_cache_node[SIZE_NODE + nid], nid);
 		}
 	}
diff --git a/mm/slab_common.c b/mm/slab_common.c
index e7903bd28b1f..0f465eae32f6 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1028,7 +1028,7 @@ struct kmem_cache *__init create_kmalloc_cache(const char *name,
 }
 
 struct kmem_cache *
-kmalloc_caches[NR_KMALLOC_TYPES][KMALLOC_CACHE_NUM] __ro_after_init =
+kmalloc_caches[KMALLOC_CACHE_NUM][NR_KMALLOC_TYPES] __ro_after_init =
 { /* initialization for https://bugs.llvm.org/show_bug.cgi?id=42570 */ };
 EXPORT_SYMBOL(kmalloc_caches);
 
@@ -1090,7 +1090,7 @@ struct kmem_cache *kmalloc_slab(size_t size, gfp_t flags)
 		index = fls(size - 1) - KMALLOC_IDX_ADJ_2;
 	}
 
-	return kmalloc_caches[kmalloc_type(flags)][index];
+	return kmalloc_caches[index][kmalloc_type(flags)];
 }
 
 #ifdef CONFIG_ZONE_DMA
@@ -1168,7 +1168,7 @@ void __init setup_kmalloc_cache_index_table(void)
 static __always_inline void __init
 new_kmalloc_cache(int idx, enum kmalloc_cache_type type, slab_flags_t flags)
 {
-	kmalloc_caches[type][idx] = create_kmalloc_cache(
+	kmalloc_caches[idx][type] = create_kmalloc_cache(
 					kmalloc_info[idx].name[type],
 					kmalloc_info[idx].size, flags, 0,
 					kmalloc_info[idx].size);
@@ -1184,7 +1184,7 @@ void __init create_kmalloc_caches(slab_flags_t flags)
 	int i;
 
 	for (i = 0; i < KMALLOC_CACHE_NUM; i++) {
-		if (!kmalloc_caches[KMALLOC_NORMAL][i])
+		if (!kmalloc_caches[i][KMALLOC_NORMAL])
 			new_kmalloc_cache(i, KMALLOC_NORMAL, flags);
 
 		new_kmalloc_cache(i, KMALLOC_RECLAIM,
diff --git a/mm/slub.c b/mm/slub.c
index 0e92ebdcacc9..e87243a16768 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4711,7 +4711,7 @@ static void __init resiliency_test(void)
 	pr_err("\n1. kmalloc-16: Clobber Redzone/next pointer 0x12->0x%p\n\n",
 	       p + 16);
 
-	validate_slab_cache(kmalloc_caches[type][1]);
+	validate_slab_cache(kmalloc_caches[1][type]);
 
 	/* Hmmm... The next two are dangerous */
 	p = kzalloc(32, GFP_KERNEL);
@@ -4720,33 +4720,33 @@ static void __init resiliency_test(void)
 	       p);
 	pr_err("If allocated object is overwritten then not detectable\n\n");
 
-	validate_slab_cache(kmalloc_caches[type][2]);
+	validate_slab_cache(kmalloc_caches[2][type]);
 	p = kzalloc(64, GFP_KERNEL);
 	p += 64 + (get_cycles() & 0xff) * sizeof(void *);
 	*p = 0x56;
 	pr_err("\n3. kmalloc-64: corrupting random byte 0x56->0x%p\n",
 	       p);
 	pr_err("If allocated object is overwritten then not detectable\n\n");
-	validate_slab_cache(kmalloc_caches[type][3]);
+	validate_slab_cache(kmalloc_caches[3][type]);
 
 	pr_err("\nB. Corruption after free\n");
 	p = kzalloc(128, GFP_KERNEL);
 	kfree(p);
 	*p = 0x78;
 	pr_err("1. kmalloc-128: Clobber first word 0x78->0x%p\n\n", p);
-	validate_slab_cache(kmalloc_caches[type][5]);
+	validate_slab_cache(kmalloc_caches[5][type]);
 
 	p = kzalloc(256, GFP_KERNEL);
 	kfree(p);
 	p[50] = 0x9a;
 	pr_err("\n2. kmalloc-256: Clobber 50th byte 0x9a->0x%p\n\n", p);
-	validate_slab_cache(kmalloc_caches[type][7]);
+	validate_slab_cache(kmalloc_caches[7][type]);
 
 	p = kzalloc(512, GFP_KERNEL);
 	kfree(p);
 	p[512] = 0xab;
 	pr_err("\n3. kmalloc-512: Clobber redzone 0xab->0x%p\n\n", p);
-	validate_slab_cache(kmalloc_caches[type][8]);
+	validate_slab_cache(kmalloc_caches[8][type]);
 }
 #else
 #ifdef CONFIG_SYSFS
-- 
2.21.0