[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH 10/13 v7] dump: add APIs to operate DataCache
From: |
qiaonuohan |
Subject: |
[Qemu-devel] [PATCH 10/13 v7] dump: add APIs to operate DataCache |
Date: |
Fri, 17 Jan 2014 15:46:16 +0800 |
DataCache is used to store data temporarily, then the data will be written to
vmcore. These functions will be called later when writing data of page to
vmcore.
Signed-off-by: Qiao Nuohan <address@hidden>
Reviewed-by: Laszlo Ersek <address@hidden>
---
dump.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
include/sysemu/dump.h | 9 +++++++++
2 files changed, 56 insertions(+), 0 deletions(-)
diff --git a/dump.c b/dump.c
index 26a1756..fa183cb 100644
--- a/dump.c
+++ b/dump.c
@@ -1173,6 +1173,53 @@ out:
return ret;
}
+static void prepare_data_cache(DataCache *data_cache, DumpState *s,
+ off_t offset)
+{
+ data_cache->fd = s->fd;
+ data_cache->data_size = 0;
+ data_cache->buf_size = BUFSIZE_DATA_CACHE;
+ data_cache->buf = g_malloc0(BUFSIZE_DATA_CACHE);
+ data_cache->offset = offset;
+}
+
+static int write_cache(DataCache *dc, const void *buf, size_t size,
+ bool flag_sync)
+{
+ /*
+ * dc->buf_size should not be less than size, otherwise dc will never be
+ * enough
+ */
+ assert(size <= dc->buf_size);
+
+ /*
+ * if flag_sync is set, synchronize data in dc->buf into vmcore.
+ * otherwise check if the space is enough for caching data in buf, if not,
+ * write the data in dc->buf to dc->fd and reset dc->buf
+ */
+ if ((!flag_sync && dc->data_size + size > dc->buf_size) ||
+ (flag_sync && dc->data_size > 0)) {
+ if (write_buffer(dc->fd, dc->offset, dc->buf, dc->data_size) < 0) {
+ return -1;
+ }
+
+ dc->offset += dc->data_size;
+ dc->data_size = 0;
+ }
+
+ if (!flag_sync) {
+ memcpy(dc->buf + dc->data_size, buf, size);
+ dc->data_size += size;
+ }
+
+ return 0;
+}
+
+static void free_data_cache(DataCache *data_cache)
+{
+ g_free(data_cache->buf);
+}
+
static ram_addr_t get_start_block(DumpState *s)
{
GuestPhysBlock *block;
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index 6d4d0bc..92a95e4 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -41,6 +41,7 @@
#define DISKDUMP_HEADER_BLOCKS (1)
#define BUFSIZE_BITMAP (TARGET_PAGE_SIZE)
#define PFN_BUFBITMAP (CHAR_BIT * BUFSIZE_BITMAP)
+#define BUFSIZE_DATA_CACHE (TARGET_PAGE_SIZE * 4)
typedef struct ArchDumpInfo {
int d_machine; /* Architecture */
@@ -142,6 +143,14 @@ typedef struct QEMU_PACKED KdumpSubHeader64 {
uint64_t max_mapnr_64; /* header_version 6 and later */
} KdumpSubHeader64;
+typedef struct DataCache {
+ int fd; /* fd of the file where to write the cached data */
+ uint8_t *buf; /* buffer for cached data */
+ size_t buf_size; /* size of the buf */
+ size_t data_size; /* size of cached data in buf */
+ off_t offset; /* offset of the file */
+} DataCache;
+
struct GuestPhysBlockList; /* memory_mapping.h */
int cpu_get_dump_info(ArchDumpInfo *info,
const struct GuestPhysBlockList *guest_phys_blocks);
--
1.7.1
- [Qemu-devel] [PATCH 01/13 v7] dump: const-qualify the buf of WriteCoreDumpFunction, (continued)
- [Qemu-devel] [PATCH 05/13 v7] dump: add API to write elf notes to buffer, qiaonuohan, 2014/01/17
- [Qemu-devel] [PATCH 10/13 v7] dump: add APIs to operate DataCache,
qiaonuohan <=
- [Qemu-devel] [PATCH 11/13 v7] dump: add API to write dump pages, qiaonuohan, 2014/01/17
- [Qemu-devel] [PATCH 03/13 v7] dump: add API to write header of flatten format, qiaonuohan, 2014/01/17
- [Qemu-devel] [PATCH 02/13 v7] dump: add argument to write_elfxx_notes, qiaonuohan, 2014/01/17
- [Qemu-devel] [PATCH 09/13 v7] dump: add API to write dump_bitmap, qiaonuohan, 2014/01/17
- [Qemu-devel] [PATCH 08/13 v7] dump: add API to write dump header, qiaonuohan, 2014/01/17