The patch titled
Subject: userfaultfd: non-cooperative: optimize mremap_userfaultfd_complete()
has been added to the -mm tree. Its filename is
userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: userfaultfd: non-cooperative: optimize mremap_userfaultfd_complete()
Optimize the mremap_userfaultfd_complete() interface to pass only the
vm_userfaultfd_ctx pointer through the stack as a microoptimization.
Link: http://lkml.kernel.org/r/20161216144821.5183-13-aarcange@xxxxxxxxxx
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Reported-by: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Acked-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Michael Rapoport <RAPOPORT@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/userfaultfd.c | 4 ++--
include/linux/userfaultfd_k.h | 4 ++--
mm/mremap.c | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)
diff -puN fs/userfaultfd.c~userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete fs/userfaultfd.c
--- a/fs/userfaultfd.c~userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete
+++ a/fs/userfaultfd.c
@@ -575,11 +575,11 @@ void mremap_userfaultfd_prep(struct vm_a
}
}
-void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx vm_ctx,
+void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *vm_ctx,
unsigned long from, unsigned long to,
unsigned long len)
{
- struct userfaultfd_ctx *ctx = vm_ctx.ctx;
+ struct userfaultfd_ctx *ctx = vm_ctx->ctx;
struct userfaultfd_wait_queue ewq;
if (!ctx)
diff -puN include/linux/userfaultfd_k.h~userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete include/linux/userfaultfd_k.h
--- a/include/linux/userfaultfd_k.h~userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete
+++ a/include/linux/userfaultfd_k.h
@@ -57,7 +57,7 @@ extern void dup_userfaultfd_complete(str
extern void mremap_userfaultfd_prep(struct vm_area_struct *,
struct vm_userfaultfd_ctx *);
-extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx,
+extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *,
unsigned long from, unsigned long to,
unsigned long len);
@@ -100,7 +100,7 @@ static inline void mremap_userfaultfd_pr
{
}
-static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx ctx,
+static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *ctx,
unsigned long from,
unsigned long to,
unsigned long len)
diff -puN mm/mremap.c~userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete mm/mremap.c
--- a/mm/mremap.c~userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete
+++ a/mm/mremap.c
@@ -608,6 +608,6 @@ out:
up_write(¤t->mm->mmap_sem);
if (locked && new_len > old_len)
mm_populate(new_addr + old_len, new_len - old_len);
- mremap_userfaultfd_complete(uf, addr, new_addr, old_len);
+ mremap_userfaultfd_complete(&uf, addr, new_addr, old_len);
return ret;
}
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
userfaultfd-document-_ior-_iow.patch
userfaultfd-correct-comment-about-uffd_feature_pagefault_flag_wp.patch
userfaultfd-convert-bug-to-warn_on_once.patch
userfaultfd-use-vma_is_anonymous.patch
userfaultfd-non-cooperative-report-all-available-features-to-userland.patch
userfaultfd-non-cooperative-add-fork-event-build-warning-fix.patch
userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete.patch
userfaultfd-non-cooperative-avoid-madv_dontneed-race-condition.patch
userfaultfd-non-cooperative-wake-userfaults-after-uffdio_unregister.patch
userfaultfd-hugetlbfs-gup-support-vm_fault_retry.patch
userfaultfd-hugetlbfs-uffd_feature_missing_hugetlbfs.patch
userfaultfd-shmem-add-tlbflushh-header-for-microblaze.patch
userfaultfd-shmem-lock-the-page-before-adding-it-to-pagecache.patch
userfaultfd-shmem-avoid-leaking-blocks-and-used-blocks-in-uffdio_copy.patch
userfaultfd-hugetlbfs-uffd_feature_missing_shmem.patch
userfaultfd-selftest-test-uffdio_zeropage-on-all-memory-types.patch
mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock.patch
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