If area is close to TASK_SIZE limit the high address
may exceed it returning error once we try to read
pagemap file. So limit the high address.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
pagemap-cache.c: In function ‘pmc_init’:
pagemap-cache.c:35:20: error: comparison of distinct pointer types lacks a cast [-Werror]
pagemap-cache.c: In function ‘pmc_fill_cache’:
pagemap-cache.c:72:2: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c:72:2: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c:72:2: error: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘size_t’ [-Werror=format]
pagemap-cache.c:89:3: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c:89:3: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c💯4: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 3 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c💯4: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c: In function ‘pmc_get_map’:
pagemap-cache.c:136:3: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 6 has type ‘uint64_t’ [-Werror=format]
pagemap-cache.c:136:3: error: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 7 has type ‘uint64_t’ [-Werror=format]
Reported-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Pavel reported that in case if there a big number
of small vmas present in the dumpee we're reading
/proc/pid/pagemap too frequently.
To speedup this procedue we inroduce pagemap cache.
The interface is:
- pmc_init/pmc_fini for cache initialization and freeing
- pmc_get_map to retrieve specific PMEs array for VMA area
v2:
- Move internal constants to pagemap-cache.c
- Make PAGEMAP_LEN to accept virtual address/size
- Don't adjust low bound in caching mode to save a couple of code bytes
Reported-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
