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-rw-r--r--tools/vm/page-types.c35
1 files changed, 32 insertions, 3 deletions
diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index 05654f5e48d5..c4d6d2e20e0d 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -32,6 +32,8 @@
#include <assert.h>
#include <ftw.h>
#include <time.h>
+#include <setjmp.h>
+#include <signal.h>
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
@@ -824,21 +826,38 @@ static void show_file(const char *name, const struct stat *st)
atime, now - st->st_atime);
}
+static sigjmp_buf sigbus_jmp;
+
+static void * volatile sigbus_addr;
+
+static void sigbus_handler(int sig, siginfo_t *info, void *ucontex)
+{
+ (void)sig;
+ (void)ucontex;
+ sigbus_addr = info ? info->si_addr : NULL;
+ siglongjmp(sigbus_jmp, 1);
+}
+
+static struct sigaction sigbus_action = {
+ .sa_sigaction = sigbus_handler,
+ .sa_flags = SA_SIGINFO,
+};
+
static void walk_file(const char *name, const struct stat *st)
{
uint8_t vec[PAGEMAP_BATCH];
uint64_t buf[PAGEMAP_BATCH], flags;
unsigned long nr_pages, pfn, i;
+ off_t off, end = st->st_size;
int fd;
- off_t off;
ssize_t len;
void *ptr;
int first = 1;
fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
- for (off = 0; off < st->st_size; off += len) {
- nr_pages = (st->st_size - off + page_size - 1) / page_size;
+ for (off = 0; off < end; off += len) {
+ nr_pages = (end - off + page_size - 1) / page_size;
if (nr_pages > PAGEMAP_BATCH)
nr_pages = PAGEMAP_BATCH;
len = nr_pages * page_size;
@@ -855,11 +874,19 @@ static void walk_file(const char *name, const struct stat *st)
if (madvise(ptr, len, MADV_RANDOM))
fatal("madvice failed: %s", name);
+ if (sigsetjmp(sigbus_jmp, 1)) {
+ end = off + sigbus_addr ? sigbus_addr - ptr : 0;
+ fprintf(stderr, "got sigbus at offset %lld: %s\n",
+ (long long)end, name);
+ goto got_sigbus;
+ }
+
/* populate ptes */
for (i = 0; i < nr_pages ; i++) {
if (vec[i] & 1)
(void)*(volatile int *)(ptr + i * page_size);
}
+got_sigbus:
/* turn off harvesting reference bits */
if (madvise(ptr, len, MADV_SEQUENTIAL))
@@ -910,6 +937,7 @@ static void walk_page_cache(void)
kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
+ sigaction(SIGBUS, &sigbus_action, NULL);
if (stat(opt_file, &st))
fatal("stat failed: %s\n", opt_file);
@@ -925,6 +953,7 @@ static void walk_page_cache(void)
close(kpageflags_fd);
close(pagemap_fd);
+ signal(SIGBUS, SIG_DFL);
}
static void parse_file(const char *name)