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| author | Keir Fraser <keir@xensource.com> | 2007-02-24 14:48:17 +0000 |
|---|---|---|
| committer | Keir Fraser <keir@xensource.com> | 2007-02-24 14:48:17 +0000 |
| commit | e0b421d24279d3cce426c0df4bf6d8734c6ce325 (patch) | |
| tree | 1c085426682541ba5f472f51948d2f61d3ff0372 /tools/libxc/xc_private.h | |
| parent | 6948b541999a27d5dbf3cfe05b41d34ed3765ce8 (diff) | |
| download | xen-e0b421d24279d3cce426c0df4bf6d8734c6ce325.tar.gz xen-e0b421d24279d3cce426c0df4bf6d8734c6ce325.tar.bz2 xen-e0b421d24279d3cce426c0df4bf6d8734c6ce325.zip | |
Reduce impact of saving/restoring/dumping large domains on Dom0 memory
usage by means of fadvise64() to tell the OS to discard the cache
pages used for the save/dump file.
Signed-off-by: Simon Graham <Simon.Graham@stratus.com>
Diffstat (limited to 'tools/libxc/xc_private.h')
| -rw-r--r-- | tools/libxc/xc_private.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/libxc/xc_private.h b/tools/libxc/xc_private.h index 7705063326..13935d361b 100644 --- a/tools/libxc/xc_private.h +++ b/tools/libxc/xc_private.h @@ -41,6 +41,13 @@ #define INFO 1 #define PROGRESS 0 +/* +** Define max dirty page cache to permit during save/restore -- need to balance +** keeping cache usage down with CPU impact of invalidating too often. +** (Currently 16MB) +*/ +#define MAX_PAGECACHE_USAGE (4*1024) + #if INFO #define IPRINTF(_f, _a...) printf(_f , ## _a) #else @@ -158,4 +165,7 @@ int xc_waitdomain_core(int xc_handle, int domain, int *status, void bitmap_64_to_byte(uint8_t *bp, const uint64_t *lp, int nbits); void bitmap_byte_to_64(uint64_t *lp, const uint8_t *bp, int nbits); +/* Optionally flush file to disk and discard page cache */ +int discard_file_cache(int fd, int flush); + #endif /* __XC_PRIVATE_H__ */ |