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[Qemu-devel] [PATCH v4 1/2] ramblock: add RAMBLOCK_FOREACH()


From: Peter Xu
Subject: [Qemu-devel] [PATCH v4 1/2] ramblock: add RAMBLOCK_FOREACH()
Date: Mon, 8 May 2017 14:00:03 +0800

So that it can simplifies the iterators.

Signed-off-by: Peter Xu <address@hidden>
---
 exec.c                 | 22 +++++++++++-----------
 include/exec/ramlist.h |  5 +++++
 migration/ram.c        | 15 ++++++++-------
 3 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/exec.c b/exec.c
index eac6085..50519ae 100644
--- a/exec.c
+++ b/exec.c
@@ -978,7 +978,7 @@ static RAMBlock *qemu_get_ram_block(ram_addr_t addr)
     if (block && addr - block->offset < block->max_length) {
         return block;
     }
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         if (addr - block->offset < block->max_length) {
             goto found;
         }
@@ -1578,12 +1578,12 @@ static ram_addr_t find_ram_offset(ram_addr_t size)
         return 0;
     }
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         ram_addr_t end, next = RAM_ADDR_MAX;
 
         end = block->offset + block->max_length;
 
-        QLIST_FOREACH_RCU(next_block, &ram_list.blocks, next) {
+        RAMBLOCK_FOREACH(next_block) {
             if (next_block->offset >= end) {
                 next = MIN(next, next_block->offset);
             }
@@ -1609,7 +1609,7 @@ unsigned long last_ram_page(void)
     ram_addr_t last = 0;
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         last = MAX(last, block->offset + block->max_length);
     }
     rcu_read_unlock();
@@ -1659,7 +1659,7 @@ void qemu_ram_set_idstr(RAMBlock *new_block, const char 
*name, DeviceState *dev)
     pstrcat(new_block->idstr, sizeof(new_block->idstr), name);
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         if (block != new_block &&
             !strcmp(block->idstr, new_block->idstr)) {
             fprintf(stderr, "RAMBlock \"%s\" already registered, abort!\n",
@@ -1693,7 +1693,7 @@ size_t qemu_ram_pagesize_largest(void)
     RAMBlock *block;
     size_t largest = 0;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         largest = MAX(largest, qemu_ram_pagesize(block));
     }
 
@@ -1839,7 +1839,7 @@ static void ram_block_add(RAMBlock *new_block, Error 
**errp)
      * QLIST (which has an RCU-friendly variant) does not have insertion at
      * tail, so save the last element in last_block.
      */
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         last_block = block;
         if (block->max_length < new_block->max_length) {
             break;
@@ -2021,7 +2021,7 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t length)
     int flags;
     void *area, *vaddr;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         offset = addr - block->offset;
         if (offset < block->max_length) {
             vaddr = ramblock_ptr(block, offset);
@@ -2167,7 +2167,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool 
round_offset,
         goto found;
     }
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         /* This case append when the block is not mapped. */
         if (block->host == NULL) {
             continue;
@@ -2200,7 +2200,7 @@ RAMBlock *qemu_ram_block_by_name(const char *name)
 {
     RAMBlock *block;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         if (!strcmp(name, block->idstr)) {
             return block;
         }
@@ -3424,7 +3424,7 @@ int qemu_ram_foreach_block(RAMBlockIterFunc func, void 
*opaque)
     int ret = 0;
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         ret = func(block->idstr, block->host, block->offset,
                    block->used_length, opaque);
         if (ret) {
diff --git a/include/exec/ramlist.h b/include/exec/ramlist.h
index c59880d..f1c6b45 100644
--- a/include/exec/ramlist.h
+++ b/include/exec/ramlist.h
@@ -4,6 +4,7 @@
 #include "qemu/queue.h"
 #include "qemu/thread.h"
 #include "qemu/rcu.h"
+#include "qemu/rcu_queue.h"
 
 typedef struct RAMBlockNotifier RAMBlockNotifier;
 
@@ -54,6 +55,10 @@ typedef struct RAMList {
 } RAMList;
 extern RAMList ram_list;
 
+/* Should be holding either ram_list.mutex, or the RCU lock. */
+#define  RAMBLOCK_FOREACH(block)  \
+    QLIST_FOREACH_RCU(block, &ram_list.blocks, next)
+
 void qemu_mutex_lock_ramlist(void);
 void qemu_mutex_unlock_ramlist(void);
 
diff --git a/migration/ram.c b/migration/ram.c
index f48664e..7ba5d7e 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -672,7 +672,7 @@ uint64_t ram_pagesize_summary(void)
     RAMBlock *block;
     uint64_t summary = 0;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         summary |= block->page_size;
     }
 
@@ -700,7 +700,7 @@ static void migration_bitmap_sync(RAMState *rs)
 
     qemu_mutex_lock(&rs->bitmap_mutex);
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         migration_bitmap_sync_range(rs, block, 0, block->used_length);
     }
     rcu_read_unlock();
@@ -1439,8 +1439,9 @@ uint64_t ram_bytes_total(void)
     uint64_t total = 0;
 
     rcu_read_lock();
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next)
+    RAMBLOCK_FOREACH(block) {
         total += block->used_length;
+    }
     rcu_read_unlock();
     return total;
 }
@@ -1543,7 +1544,7 @@ void ram_postcopy_migrated_memory_release(MigrationState 
*ms)
     struct RAMBlock *block;
     unsigned long *bitmap = atomic_rcu_read(&rs->ram_bitmap)->bmap;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         unsigned long first = block->offset >> TARGET_PAGE_BITS;
         unsigned long range = first + (block->used_length >> TARGET_PAGE_BITS);
         unsigned long run_start = find_next_zero_bit(bitmap, range, first);
@@ -1624,7 +1625,7 @@ static int postcopy_each_ram_send_discard(MigrationState 
*ms)
     struct RAMBlock *block;
     int ret;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         unsigned long first = block->offset >> TARGET_PAGE_BITS;
         PostcopyDiscardState *pds = postcopy_discard_send_init(ms,
                                                                first,
@@ -1802,7 +1803,7 @@ static int postcopy_chunk_hostpages(MigrationState *ms)
     rs->last_sent_block = NULL;
     rs->last_page = 0;
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         unsigned long first = block->offset >> TARGET_PAGE_BITS;
 
         PostcopyDiscardState *pds =
@@ -2021,7 +2022,7 @@ static int ram_save_setup(QEMUFile *f, void *opaque)
 
     qemu_put_be64(f, ram_bytes_total() | RAM_SAVE_FLAG_MEM_SIZE);
 
-    QLIST_FOREACH_RCU(block, &ram_list.blocks, next) {
+    RAMBLOCK_FOREACH(block) {
         qemu_put_byte(f, strlen(block->idstr));
         qemu_put_buffer(f, (uint8_t *)block->idstr, strlen(block->idstr));
         qemu_put_be64(f, block->used_length);
-- 
2.7.4




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