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[Qemu-devel] [PATCH v6 08/11] dump: Add APIs to operate DataCache
From: |
Qiao Nuohan |
Subject: |
[Qemu-devel] [PATCH v6 08/11] dump: Add APIs to operate DataCache |
Date: |
Sun, 5 Jan 2014 15:27:41 +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>
---
dump.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++++
include/sysemu/dump.h | 9 ++++++++
2 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/dump.c b/dump.c
index 1fae152..b4c40f2 100644
--- a/dump.c
+++ b/dump.c
@@ -1088,6 +1088,58 @@ out:
return ret;
}
+static void prepare_data_cache(DataCache *data_cache, DumpState *s)
+{
+ 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);
+}
+
+static int write_cache(DataCache *dc, bool flag_flatten, void *buf, size_t
size)
+{
+ /*
+ * check if the space is enough to cache data, if not, write the cached
+ * data to dc->fd and reset the buf
+ */
+ if (dc->data_size + size > dc->buf_size) {
+ if (write_buffer(dc->fd, flag_flatten, dc->offset, dc->buf,
+ dc->data_size) < 0) {
+ return -1;
+ }
+
+ dc->offset += dc->data_size;
+ dc->data_size = 0;
+ }
+
+ memcpy(dc->buf + dc->data_size, buf, size);
+ dc->data_size += size;
+
+ return 0;
+}
+
+/* write the remaining data in dc->buf to dc->fd */
+static int sync_data_cache(DataCache *dc, bool flag_flatten)
+{
+ if (dc->data_size == 0) {
+ return 0;
+ }
+
+ if (write_buffer(dc->fd, flag_flatten, dc->offset, dc->buf,
+ dc->data_size) < 0) {
+ return -1;
+ }
+
+ dc->offset += dc->data_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 b5eaf8d..ab44af8 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -36,6 +36,7 @@
#define BUFSIZE_BITMAP (PAGE_SIZE)
#define PFN_BUFBITMAP (CHAR_BIT * BUFSIZE_BITMAP)
#define ARCH_PFN_OFFSET (0)
+#define BUFSIZE_DATA_CACHE (PAGE_SIZE * 4)
#define paddr_to_pfn(X, page_shift) \
(((unsigned long long)(X) >> (page_shift)) - ARCH_PFN_OFFSET)
@@ -140,6 +141,14 @@ 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 */
+ char *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
- Re: [Qemu-devel] [PATCH v6 03/11] dump: Add API to write vmcore, (continued)
- [Qemu-devel] [PATCH v6 11/11] Add 'query-dump-guest-memory-capability' command, Qiao Nuohan, 2014/01/05
- [Qemu-devel] [PATCH v6 02/11] dump: Add API to write header of flatten format, Qiao Nuohan, 2014/01/05
- [Qemu-devel] [PATCH v6 04/11] dump: Add API to write elf notes to buffer, Qiao Nuohan, 2014/01/05
- [Qemu-devel] [PATCH v6 10/11] dump: Make kdump-compressed format available for 'dump-guest-memory', Qiao Nuohan, 2014/01/05
- [Qemu-devel] [PATCH v6 08/11] dump: Add APIs to operate DataCache,
Qiao Nuohan <=
- [Qemu-devel] [PATCH v6 09/11] dump: Add API to write dump pages, Qiao Nuohan, 2014/01/05
- [Qemu-devel] [PATCH v6 07/11] dump: Add API to write dump_bitmap, Qiao Nuohan, 2014/01/05
- [Qemu-devel] [PATCH v6 01/11] dump: Add argument to write_elfxx_notes, Qiao Nuohan, 2014/01/05