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mem: Handle the case when kernel doesn't support dirty track reset

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Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Acked-by: Andrew Vagin <avagin@virtuozzo.com>
Tested-by: Adrian Reber <adrian@lisas.de>
This commit is contained in:
Pavel Emelyanov 2016-01-18 21:09:07 +03:00
parent d7684252c8
commit 6853c480ad
1 changed files with 11 additions and 6 deletions
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17
mem.c
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@ -50,15 +50,20 @@ int do_task_reset_dirty_track(int pid)
return errno == EACCES ? 1 : -1;
ret = write(fd, cmd, sizeof(cmd));
close(fd);
if (ret < 0) {
pr_warn("Can't reset %d's dirty memory tracker (%d)\n", pid, errno);
return -1;
if (errno == EINVAL) /* No clear-soft-dirty in kernel */
ret = 1;
else {
pr_perror("Can't reset %d's dirty memory tracker (%d)\n", pid, errno);
ret = -1;
}
} else {
pr_info(" ... done\n");
ret = 0;
}
pr_info(" ... done\n");
return 0;
close(fd);
return ret;
}
unsigned int dump_pages_args_size(struct vm_area_list *vmas)