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userfaultfd: non-cooperative: rename *EVENT_MADVDONTNEED to *EVENT_REMOVE

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Patch series "userfaultfd: non-cooperative: add madvise() event for
MADV_REMOVE request".

These patches add notification of madvise(MADV_REMOVE) event to
non-cooperative userfaultfd monitor.

The first pacth renames EVENT_MADVDONTNEED to EVENT_REMOVE along with
relevant functions and structures.  Using _REMOVE instead of
_MADVDONTNEED describes the event semantics more clearly and I hope it's
not too late for such change in the ABI.

This patch (of 3):

The UFFD_EVENT_MADVDONTNEED purpose is to notify uffd monitor about
removal of certain range from address space tracked by userfaultfd.
Hence, UFFD_EVENT_REMOVE seems to better reflect the operation
semantics.  Respectively, 'madv_dn' field of uffd_msg is renamed to
'remove' and the madvise_userfault_dontneed callback is renamed to
userfaultfd_remove.

Link: http://lkml.kernel.org/r/1484814154-1557-2-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mike Rapoport
2017-02-24 14:56:02 -08:00
committed by Linus Torvalds
parent 0262d9c845
commit d811914d87
5 changed files with 28 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
tools/testing/selftests/vm/userfaultfd.c
View File

@@ -398,12 +398,12 @@ static void *uffd_poll_thread(void *arg)
uffd = msg.arg.fork.ufd;
pollfd[0].fd = uffd;
break;
case UFFD_EVENT_MADVDONTNEED:
uffd_reg.range.start = msg.arg.madv_dn.start;
uffd_reg.range.len = msg.arg.madv_dn.end -
msg.arg.madv_dn.start;
case UFFD_EVENT_REMOVE:
uffd_reg.range.start = msg.arg.remove.start;
uffd_reg.range.len = msg.arg.remove.end -
msg.arg.remove.start;
if (ioctl(uffd, UFFDIO_UNREGISTER, &uffd_reg.range))
fprintf(stderr, "madv_dn failure\n"), exit(1);
fprintf(stderr, "remove failure\n"), exit(1);
break;
case UFFD_EVENT_REMAP:
area_dst = (char *)(unsigned long)msg.arg.remap.to;
@@ -570,7 +570,7 @@ static int userfaultfd_open(int features)
* mremap, the entire monitored area is accessed in a single pass for
* HUGETLB_TEST.
* The release of the pages currently generates event only for
* anonymous memory (UFFD_EVENT_MADVDONTNEED), hence it is not checked
* anonymous memory (UFFD_EVENT_REMOVE), hence it is not checked
* for hugetlb and shmem.
*/
static int faulting_process(void)
@@ -715,14 +715,14 @@ static int userfaultfd_events_test(void)
pid_t pid;
char c;
printf("testing events (fork, remap, madv_dn): ");
printf("testing events (fork, remap, remove): ");
fflush(stdout);
if (release_pages(area_dst))
return 1;
features = UFFD_FEATURE_EVENT_FORK | UFFD_FEATURE_EVENT_REMAP |
UFFD_FEATURE_EVENT_MADVDONTNEED;
UFFD_FEATURE_EVENT_REMOVE;
if (userfaultfd_open(features) < 0)
return 1;
fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);