diff options
author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2017-02-24 14:56:02 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-24 17:46:54 -0800 |
commit | d811914d87576c562e849c00d9f9beff45038801 (patch) | |
tree | 7f31dbf8e5febb2396b7428d3c821792e5ce9787 | |
parent | 0262d9c845ec349edf93f69688a5129c36cc2232 (diff) | |
download | op-kernel-dev-d811914d87576c562e849c00d9f9beff45038801.zip op-kernel-dev-d811914d87576c562e849c00d9f9beff45038801.tar.gz |
userfaultfd: non-cooperative: rename *EVENT_MADVDONTNEED to *EVENT_REMOVE
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>
-rw-r--r-- | fs/userfaultfd.c | 14 | ||||
-rw-r--r-- | include/linux/userfaultfd_k.h | 16 | ||||
-rw-r--r-- | include/uapi/linux/userfaultfd.h | 8 | ||||
-rw-r--r-- | mm/madvise.c | 2 | ||||
-rw-r--r-- | tools/testing/selftests/vm/userfaultfd.c | 16 |
5 files changed, 28 insertions, 28 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 1840615..8fe601b 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -681,16 +681,16 @@ void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *vm_ctx, userfaultfd_event_wait_completion(ctx, &ewq); } -void madvise_userfault_dontneed(struct vm_area_struct *vma, - struct vm_area_struct **prev, - unsigned long start, unsigned long end) +void userfaultfd_remove(struct vm_area_struct *vma, + struct vm_area_struct **prev, + unsigned long start, unsigned long end) { struct mm_struct *mm = vma->vm_mm; struct userfaultfd_ctx *ctx; struct userfaultfd_wait_queue ewq; ctx = vma->vm_userfaultfd_ctx.ctx; - if (!ctx || !(ctx->features & UFFD_FEATURE_EVENT_MADVDONTNEED)) + if (!ctx || !(ctx->features & UFFD_FEATURE_EVENT_REMOVE)) return; userfaultfd_ctx_get(ctx); @@ -700,9 +700,9 @@ void madvise_userfault_dontneed(struct vm_area_struct *vma, msg_init(&ewq.msg); - ewq.msg.event = UFFD_EVENT_MADVDONTNEED; - ewq.msg.arg.madv_dn.start = start; - ewq.msg.arg.madv_dn.end = end; + ewq.msg.event = UFFD_EVENT_REMOVE; + ewq.msg.arg.remove.start = start; + ewq.msg.arg.remove.end = end; userfaultfd_event_wait_completion(ctx, &ewq); diff --git a/include/linux/userfaultfd_k.h b/include/linux/userfaultfd_k.h index f431861..2521542 100644 --- a/include/linux/userfaultfd_k.h +++ b/include/linux/userfaultfd_k.h @@ -61,10 +61,10 @@ extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *, unsigned long from, unsigned long to, unsigned long len); -extern void madvise_userfault_dontneed(struct vm_area_struct *vma, - struct vm_area_struct **prev, - unsigned long start, - unsigned long end); +extern void userfaultfd_remove(struct vm_area_struct *vma, + struct vm_area_struct **prev, + unsigned long start, + unsigned long end); #else /* CONFIG_USERFAULTFD */ @@ -112,10 +112,10 @@ static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *ctx, { } -static inline void madvise_userfault_dontneed(struct vm_area_struct *vma, - struct vm_area_struct **prev, - unsigned long start, - unsigned long end) +static inline void userfaultfd_remove(struct vm_area_struct *vma, + struct vm_area_struct **prev, + unsigned long start, + unsigned long end) { } #endif /* CONFIG_USERFAULTFD */ diff --git a/include/uapi/linux/userfaultfd.h b/include/uapi/linux/userfaultfd.h index 9ac4b68..b742c40 100644 --- a/include/uapi/linux/userfaultfd.h +++ b/include/uapi/linux/userfaultfd.h @@ -20,7 +20,7 @@ #define UFFD_API ((__u64)0xAA) #define UFFD_API_FEATURES (UFFD_FEATURE_EVENT_FORK | \ UFFD_FEATURE_EVENT_REMAP | \ - UFFD_FEATURE_EVENT_MADVDONTNEED | \ + UFFD_FEATURE_EVENT_REMOVE | \ UFFD_FEATURE_MISSING_HUGETLBFS | \ UFFD_FEATURE_MISSING_SHMEM) #define UFFD_API_IOCTLS \ @@ -92,7 +92,7 @@ struct uffd_msg { struct { __u64 start; __u64 end; - } madv_dn; + } remove; struct { /* unused reserved fields */ @@ -109,7 +109,7 @@ struct uffd_msg { #define UFFD_EVENT_PAGEFAULT 0x12 #define UFFD_EVENT_FORK 0x13 #define UFFD_EVENT_REMAP 0x14 -#define UFFD_EVENT_MADVDONTNEED 0x15 +#define UFFD_EVENT_REMOVE 0x15 /* flags for UFFD_EVENT_PAGEFAULT */ #define UFFD_PAGEFAULT_FLAG_WRITE (1<<0) /* If this was a write fault */ @@ -155,7 +155,7 @@ struct uffdio_api { #define UFFD_FEATURE_PAGEFAULT_FLAG_WP (1<<0) #define UFFD_FEATURE_EVENT_FORK (1<<1) #define UFFD_FEATURE_EVENT_REMAP (1<<2) -#define UFFD_FEATURE_EVENT_MADVDONTNEED (1<<3) +#define UFFD_FEATURE_EVENT_REMOVE (1<<3) #define UFFD_FEATURE_MISSING_HUGETLBFS (1<<4) #define UFFD_FEATURE_MISSING_SHMEM (1<<5) __u64 features; diff --git a/mm/madvise.c b/mm/madvise.c index b530a49..ab5ef14 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -479,7 +479,7 @@ static long madvise_dontneed(struct vm_area_struct *vma, if (!can_madv_dontneed_vma(vma)) return -EINVAL; - madvise_userfault_dontneed(vma, prev, start, end); + userfaultfd_remove(vma, prev, start, end); zap_page_range(vma, start, end - start); return 0; } diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 5a840a6..9eb77df 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -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); |