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kerndat: Introduce the storage of kernel run-time info

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One of such things we use right now is the device for anon shmem
mappings backing. In the furure this can be extended to check for
various kernel features.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov
2013-04-15 13:02:09 +04:00
parent 41c7ca8218
commit 5b343b40eb
5 changed files with 71 additions and 30 deletions
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33
proc_parse.c
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@@ -18,6 +18,7 @@
#include "file-lock.h"
#include "pstree.h"
#include "fsnotify.h"
#include "kerndat.h"
#include "proc_parse.h"
#include "protobuf.h"
@@ -133,37 +134,9 @@ static int parse_vmflags(char *buf, struct vma_area *vma_area)
return 0;
}
static int is_anon_shmem_map(dev_t dev)
static inline int is_anon_shmem_map(dev_t dev)
{
static dev_t shmem_dev = 0;
if (!shmem_dev) {
void *map;
char maps[128];
struct stat buf;
map = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, 0, 0);
if (map == MAP_FAILED) {
pr_perror("Can't mmap piggie");
return -1;
}
sprintf(maps, "/proc/%d/map_files/%lx-%lx",
getpid(), (unsigned long)map,
(unsigned long)map + PAGE_SIZE);
if (stat(maps, &buf) < 0) {
pr_perror("Can't stat piggie");
return -1;
}
munmap(map, PAGE_SIZE);
shmem_dev = buf.st_dev;
pr_info("Found anon-shmem piggie at %"PRIx64"\n", shmem_dev);
}
return shmem_dev == dev;
return kerndat_shmem_dev == dev;
}
int parse_smaps(pid_t pid, struct vm_area_list *vma_area_list, bool use_map_files)