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authorIlya Dryomov <idryomov@gmail.com>2018-10-15 17:38:23 +0200
committerIlya Dryomov <idryomov@gmail.com>2018-10-22 10:28:22 +0200
commit0d9c1ab3be4c0187663096a6a084421d0a1e45c6 (patch)
tree06a57638913d5badd76fe695bcb4f08992f55579 /net/ceph
parent26f887e0a3c43f67b550e2e5d8a76e86ca11d188 (diff)
downloadlinux-stericsson-0d9c1ab3be4c0187663096a6a084421d0a1e45c6.tar.gz
libceph: preallocate message data items
Currently message data items are allocated with ceph_msg_data_create() in setup_request_data() inside send_request(). send_request() has never been allowed to fail, so each allocation is followed by a BUG_ON: data = ceph_msg_data_create(...); BUG_ON(!data); It's been this way since support for multiple message data items was added in commit 6644ed7b7e04 ("libceph: make message data be a pointer") in 3.10. There is no reason to delay the allocation of message data items until the last possible moment and we certainly don't need a linked list of them as they are only ever appended to the end and never erased. Make ceph_msg_new2() take max_data_items and adapt the rest of the code. Reported-by: Jerry Lee <leisurelysw24@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'net/ceph')
-rw-r--r--net/ceph/messenger.c106
-rw-r--r--net/ceph/msgpool.c25
-rw-r--r--net/ceph/osd_client.c102
3 files changed, 144 insertions, 89 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 76684edc43ef..88e35830198c 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -156,7 +156,6 @@ static bool con_flag_test_and_set(struct ceph_connection *con,
/* Slab caches for frequently-allocated structures */
static struct kmem_cache *ceph_msg_cache;
-static struct kmem_cache *ceph_msg_data_cache;
/* static tag bytes (protocol control messages) */
static char tag_msg = CEPH_MSGR_TAG_MSG;
@@ -235,23 +234,11 @@ static int ceph_msgr_slab_init(void)
if (!ceph_msg_cache)
return -ENOMEM;
- BUG_ON(ceph_msg_data_cache);
- ceph_msg_data_cache = KMEM_CACHE(ceph_msg_data, 0);
- if (ceph_msg_data_cache)
- return 0;
-
- kmem_cache_destroy(ceph_msg_cache);
- ceph_msg_cache = NULL;
-
- return -ENOMEM;
+ return 0;
}
static void ceph_msgr_slab_exit(void)
{
- BUG_ON(!ceph_msg_data_cache);
- kmem_cache_destroy(ceph_msg_data_cache);
- ceph_msg_data_cache = NULL;
-
BUG_ON(!ceph_msg_cache);
kmem_cache_destroy(ceph_msg_cache);
ceph_msg_cache = NULL;
@@ -1141,16 +1128,13 @@ static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor)
static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
{
struct ceph_msg_data_cursor *cursor = &msg->cursor;
- struct ceph_msg_data *data;
BUG_ON(!length);
BUG_ON(length > msg->data_length);
- BUG_ON(list_empty(&msg->data));
+ BUG_ON(!msg->num_data_items);
- cursor->data_head = &msg->data;
cursor->total_resid = length;
- data = list_first_entry(&msg->data, struct ceph_msg_data, links);
- cursor->data = data;
+ cursor->data = msg->data;
__ceph_msg_data_cursor_init(cursor);
}
@@ -1231,8 +1215,7 @@ static void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
if (!cursor->resid && cursor->total_resid) {
WARN_ON(!cursor->last_piece);
- BUG_ON(list_is_last(&cursor->data->links, cursor->data_head));
- cursor->data = list_next_entry(cursor->data, links);
+ cursor->data++;
__ceph_msg_data_cursor_init(cursor);
new_piece = true;
}
@@ -1248,9 +1231,6 @@ static size_t sizeof_footer(struct ceph_connection *con)
static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
{
- BUG_ON(!msg);
- BUG_ON(!data_len);
-
/* Initialize data cursor */
ceph_msg_data_cursor_init(msg, (size_t)data_len);
@@ -1590,7 +1570,7 @@ static int write_partial_message_data(struct ceph_connection *con)
dout("%s %p msg %p\n", __func__, con, msg);
- if (list_empty(&msg->data))
+ if (!msg->num_data_items)
return -EINVAL;
/*
@@ -2347,8 +2327,7 @@ static int read_partial_msg_data(struct ceph_connection *con)
u32 crc = 0;
int ret;
- BUG_ON(!msg);
- if (list_empty(&msg->data))
+ if (!msg->num_data_items)
return -EIO;
if (do_datacrc)
@@ -3256,32 +3235,16 @@ bool ceph_con_keepalive_expired(struct ceph_connection *con,
return false;
}
-static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
+static struct ceph_msg_data *ceph_msg_data_add(struct ceph_msg *msg)
{
- struct ceph_msg_data *data;
-
- if (WARN_ON(!ceph_msg_data_type_valid(type)))
- return NULL;
-
- data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
- if (!data)
- return NULL;
-
- data->type = type;
- INIT_LIST_HEAD(&data->links);
-
- return data;
+ BUG_ON(msg->num_data_items >= msg->max_data_items);
+ return &msg->data[msg->num_data_items++];
}
static void ceph_msg_data_destroy(struct ceph_msg_data *data)
{
- if (!data)
- return;
-
- WARN_ON(!list_empty(&data->links));
if (data->type == CEPH_MSG_DATA_PAGELIST)
ceph_pagelist_release(data->pagelist);
- kmem_cache_free(ceph_msg_data_cache, data);
}
void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
@@ -3292,13 +3255,12 @@ void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
BUG_ON(!pages);
BUG_ON(!length);
- data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
- BUG_ON(!data);
+ data = ceph_msg_data_add(msg);
+ data->type = CEPH_MSG_DATA_PAGES;
data->pages = pages;
data->length = length;
data->alignment = alignment & ~PAGE_MASK;
- list_add_tail(&data->links, &msg->data);
msg->data_length += length;
}
EXPORT_SYMBOL(ceph_msg_data_add_pages);
@@ -3311,12 +3273,11 @@ void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
BUG_ON(!pagelist);
BUG_ON(!pagelist->length);
- data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
- BUG_ON(!data);
+ data = ceph_msg_data_add(msg);
+ data->type = CEPH_MSG_DATA_PAGELIST;
refcount_inc(&pagelist->refcnt);
data->pagelist = pagelist;
- list_add_tail(&data->links, &msg->data);
msg->data_length += pagelist->length;
}
EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
@@ -3327,12 +3288,11 @@ void ceph_msg_data_add_bio(struct ceph_msg *msg, struct ceph_bio_iter *bio_pos,
{
struct ceph_msg_data *data;
- data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
- BUG_ON(!data);
+ data = ceph_msg_data_add(msg);
+ data->type = CEPH_MSG_DATA_BIO;
data->bio_pos = *bio_pos;
data->bio_length = length;
- list_add_tail(&data->links, &msg->data);
msg->data_length += length;
}
EXPORT_SYMBOL(ceph_msg_data_add_bio);
@@ -3343,11 +3303,10 @@ void ceph_msg_data_add_bvecs(struct ceph_msg *msg,
{
struct ceph_msg_data *data;
- data = ceph_msg_data_create(CEPH_MSG_DATA_BVECS);
- BUG_ON(!data);
+ data = ceph_msg_data_add(msg);
+ data->type = CEPH_MSG_DATA_BVECS;
data->bvec_pos = *bvec_pos;
- list_add_tail(&data->links, &msg->data);
msg->data_length += bvec_pos->iter.bi_size;
}
EXPORT_SYMBOL(ceph_msg_data_add_bvecs);
@@ -3356,8 +3315,8 @@ EXPORT_SYMBOL(ceph_msg_data_add_bvecs);
* construct a new message with given type, size
* the new msg has a ref count of 1.
*/
-struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
- bool can_fail)
+struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items,
+ gfp_t flags, bool can_fail)
{
struct ceph_msg *m;
@@ -3371,7 +3330,6 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
INIT_LIST_HEAD(&m->list_head);
kref_init(&m->kref);
- INIT_LIST_HEAD(&m->data);
/* front */
if (front_len) {
@@ -3386,6 +3344,15 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
}
m->front_alloc_len = m->front.iov_len = front_len;
+ if (max_data_items) {
+ m->data = kmalloc_array(max_data_items, sizeof(*m->data),
+ flags);
+ if (!m->data)
+ goto out2;
+
+ m->max_data_items = max_data_items;
+ }
+
dout("ceph_msg_new %p front %d\n", m, front_len);
return m;
@@ -3402,6 +3369,13 @@ out:
}
return NULL;
}
+EXPORT_SYMBOL(ceph_msg_new2);
+
+struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
+ bool can_fail)
+{
+ return ceph_msg_new2(type, front_len, 0, flags, can_fail);
+}
EXPORT_SYMBOL(ceph_msg_new);
/*
@@ -3497,13 +3471,14 @@ static void ceph_msg_free(struct ceph_msg *m)
{
dout("%s %p\n", __func__, m);
kvfree(m->front.iov_base);
+ kfree(m->data);
kmem_cache_free(ceph_msg_cache, m);
}
static void ceph_msg_release(struct kref *kref)
{
struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
- struct ceph_msg_data *data, *next;
+ int i;
dout("%s %p\n", __func__, m);
WARN_ON(!list_empty(&m->list_head));
@@ -3516,11 +3491,8 @@ static void ceph_msg_release(struct kref *kref)
m->middle = NULL;
}
- list_for_each_entry_safe(data, next, &m->data, links) {
- list_del_init(&data->links);
- ceph_msg_data_destroy(data);
- }
- m->data_length = 0;
+ for (i = 0; i < m->num_data_items; i++)
+ ceph_msg_data_destroy(&m->data[i]);
if (m->pool)
ceph_msgpool_put(m->pool, m);
diff --git a/net/ceph/msgpool.c b/net/ceph/msgpool.c
index 3dddc074f0d7..e3ecb80cd182 100644
--- a/net/ceph/msgpool.c
+++ b/net/ceph/msgpool.c
@@ -14,7 +14,8 @@ static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
struct ceph_msgpool *pool = arg;
struct ceph_msg *msg;
- msg = ceph_msg_new(pool->type, pool->front_len, gfp_mask, true);
+ msg = ceph_msg_new2(pool->type, pool->front_len, pool->max_data_items,
+ gfp_mask, true);
if (!msg) {
dout("msgpool_alloc %s failed\n", pool->name);
} else {
@@ -35,11 +36,13 @@ static void msgpool_free(void *element, void *arg)
}
int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
- int front_len, int size, bool blocking, const char *name)
+ int front_len, int max_data_items, int size,
+ const char *name)
{
dout("msgpool %s init\n", name);
pool->type = type;
pool->front_len = front_len;
+ pool->max_data_items = max_data_items;
pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
if (!pool->pool)
return -ENOMEM;
@@ -53,18 +56,21 @@ void ceph_msgpool_destroy(struct ceph_msgpool *pool)
mempool_destroy(pool->pool);
}
-struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool,
- int front_len)
+struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
+ int max_data_items)
{
struct ceph_msg *msg;
- if (front_len > pool->front_len) {
- dout("msgpool_get %s need front %d, pool size is %d\n",
- pool->name, front_len, pool->front_len);
+ if (front_len > pool->front_len ||
+ max_data_items > pool->max_data_items) {
+ pr_warn_ratelimited("%s need %d/%d, pool %s has %d/%d\n",
+ __func__, front_len, max_data_items, pool->name,
+ pool->front_len, pool->max_data_items);
WARN_ON_ONCE(1);
/* try to alloc a fresh message */
- return ceph_msg_new(pool->type, front_len, GFP_NOFS, false);
+ return ceph_msg_new2(pool->type, front_len, max_data_items,
+ GFP_NOFS, false);
}
msg = mempool_alloc(pool->pool, GFP_NOFS);
@@ -80,6 +86,9 @@ void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
msg->front.iov_len = pool->front_len;
msg->hdr.front_len = cpu_to_le32(pool->front_len);
+ msg->data_length = 0;
+ msg->num_data_items = 0;
+
kref_init(&msg->kref); /* retake single ref */
mempool_free(msg, pool->pool);
}
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 7ac7f21ff317..cf0bd2cce848 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -614,12 +614,15 @@ static int ceph_oloc_encoding_size(const struct ceph_object_locator *oloc)
return 8 + 4 + 4 + 4 + (oloc->pool_ns ? oloc->pool_ns->len : 0);
}
-int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
+static int __ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp,
+ int num_request_data_items,
+ int num_reply_data_items)
{
struct ceph_osd_client *osdc = req->r_osdc;
struct ceph_msg *msg;
int msg_size;
+ WARN_ON(req->r_request || req->r_reply);
WARN_ON(ceph_oid_empty(&req->r_base_oid));
WARN_ON(ceph_oloc_empty(&req->r_base_oloc));
@@ -641,9 +644,11 @@ int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
msg_size += 4 + 8; /* retry_attempt, features */
if (req->r_mempool)
- msg = ceph_msgpool_get(&osdc->msgpool_op, msg_size);
+ msg = ceph_msgpool_get(&osdc->msgpool_op, msg_size,
+ num_request_data_items);
else
- msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp, true);
+ msg = ceph_msg_new2(CEPH_MSG_OSD_OP, msg_size,
+ num_request_data_items, gfp, true);
if (!msg)
return -ENOMEM;
@@ -656,9 +661,11 @@ int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
msg_size += req->r_num_ops * sizeof(struct ceph_osd_op);
if (req->r_mempool)
- msg = ceph_msgpool_get(&osdc->msgpool_op_reply, msg_size);
+ msg = ceph_msgpool_get(&osdc->msgpool_op_reply, msg_size,
+ num_reply_data_items);
else
- msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY, msg_size, gfp, true);
+ msg = ceph_msg_new2(CEPH_MSG_OSD_OPREPLY, msg_size,
+ num_reply_data_items, gfp, true);
if (!msg)
return -ENOMEM;
@@ -666,7 +673,6 @@ int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
return 0;
}
-EXPORT_SYMBOL(ceph_osdc_alloc_messages);
static bool osd_req_opcode_valid(u16 opcode)
{
@@ -679,6 +685,64 @@ __CEPH_FORALL_OSD_OPS(GENERATE_CASE)
}
}
+static void get_num_data_items(struct ceph_osd_request *req,
+ int *num_request_data_items,
+ int *num_reply_data_items)
+{
+ struct ceph_osd_req_op *op;
+
+ *num_request_data_items = 0;
+ *num_reply_data_items = 0;
+
+ for (op = req->r_ops; op != &req->r_ops[req->r_num_ops]; op++) {
+ switch (op->op) {
+ /* request */
+ case CEPH_OSD_OP_WRITE:
+ case CEPH_OSD_OP_WRITEFULL:
+ case CEPH_OSD_OP_SETXATTR:
+ case CEPH_OSD_OP_CMPXATTR:
+ case CEPH_OSD_OP_NOTIFY_ACK:
+ *num_request_data_items += 1;
+ break;
+
+ /* reply */
+ case CEPH_OSD_OP_STAT:
+ case CEPH_OSD_OP_READ:
+ case CEPH_OSD_OP_LIST_WATCHERS:
+ *num_reply_data_items += 1;
+ break;
+
+ /* both */
+ case CEPH_OSD_OP_NOTIFY:
+ *num_request_data_items += 1;
+ *num_reply_data_items += 1;
+ break;
+ case CEPH_OSD_OP_CALL:
+ *num_request_data_items += 2;
+ *num_reply_data_items += 1;
+ break;
+
+ default:
+ WARN_ON(!osd_req_opcode_valid(op->op));
+ break;
+ }
+ }
+}
+
+/*
+ * oid, oloc and OSD op opcode(s) must be filled in before this function
+ * is called.
+ */
+int ceph_osdc_alloc_messages(struct ceph_osd_request *req, gfp_t gfp)
+{
+ int num_request_data_items, num_reply_data_items;
+
+ get_num_data_items(req, &num_request_data_items, &num_reply_data_items);
+ return __ceph_osdc_alloc_messages(req, gfp, num_request_data_items,
+ num_reply_data_items);
+}
+EXPORT_SYMBOL(ceph_osdc_alloc_messages);
+
/*
* This is an osd op init function for opcodes that have no data or
* other information associated with them. It also serves as a
@@ -1035,7 +1099,15 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
if (flags & CEPH_OSD_FLAG_WRITE)
req->r_data_offset = off;
- r = ceph_osdc_alloc_messages(req, GFP_NOFS);
+ if (num_ops > 1)
+ /*
+ * This is a special case for ceph_writepages_start(), but it
+ * also covers ceph_uninline_data(). If more multi-op request
+ * use cases emerge, we will need a separate helper.
+ */
+ r = __ceph_osdc_alloc_messages(req, GFP_NOFS, num_ops, 0);
+ else
+ r = ceph_osdc_alloc_messages(req, GFP_NOFS);
if (r)
goto fail;
@@ -1842,13 +1914,16 @@ static bool should_plug_request(struct ceph_osd_request *req)
return true;
}
+/*
+ * Keep get_num_data_items() in sync with this function.
+ */
static void setup_request_data(struct ceph_osd_request *req,
struct ceph_msg *msg)
{
u32 data_len = 0;
int i;
- if (!list_empty(&msg->data))
+ if (msg->num_data_items)
return;
WARN_ON(msg->data_length);
@@ -4325,9 +4400,7 @@ static void handle_watch_notify(struct ceph_osd_client *osdc,
lreq->notify_id, notify_id);
} else if (!completion_done(&lreq->notify_finish_wait)) {
struct ceph_msg_data *data =
- list_first_entry_or_null(&msg->data,
- struct ceph_msg_data,
- links);
+ msg->num_data_items ? &msg->data[0] : NULL;
if (data) {
if (lreq->preply_pages) {
@@ -5036,11 +5109,12 @@ int ceph_osdc_init(struct ceph_osd_client *osdc, struct ceph_client *client)
goto out_map;
err = ceph_msgpool_init(&osdc->msgpool_op, CEPH_MSG_OSD_OP,
- PAGE_SIZE, 10, true, "osd_op");
+ PAGE_SIZE, CEPH_OSD_SLAB_OPS, 10, "osd_op");
if (err < 0)
goto out_mempool;
err = ceph_msgpool_init(&osdc->msgpool_op_reply, CEPH_MSG_OSD_OPREPLY,
- PAGE_SIZE, 10, true, "osd_op_reply");
+ PAGE_SIZE, CEPH_OSD_SLAB_OPS, 10,
+ "osd_op_reply");
if (err < 0)
goto out_msgpool;
@@ -5310,7 +5384,7 @@ static struct ceph_msg *alloc_msg_with_page_vector(struct ceph_msg_header *hdr)
u32 front_len = le32_to_cpu(hdr->front_len);
u32 data_len = le32_to_cpu(hdr->data_len);
- m = ceph_msg_new(type, front_len, GFP_NOIO, false);
+ m = ceph_msg_new2(type, front_len, 1, GFP_NOIO, false);
if (!m)
return NULL;