[v2] docs/vm: Minor editorial changes in the THP and hugetlbfs
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Message ID 20190426180429.18098-1-rcampbell@nvidia.com
State New
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  • [v2] docs/vm: Minor editorial changes in the THP and hugetlbfs
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Commit Message

Ralph Campbell April 26, 2019, 6:04 p.m. UTC
From: Ralph Campbell <rcampbell@nvidia.com>

Some minor wording changes and typo corrections.

Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
---

Changes for v2:
 Added Acked-by for Randy and Mike.
 Rebased on mmotm 2019-04-25-16-30 (in response to Yang Shi).

 Documentation/vm/hugetlbfs_reserv.rst | 17 ++++---
 Documentation/vm/transhuge.rst        | 73 ++++++++++++++-------------
 2 files changed, 46 insertions(+), 44 deletions(-)

Comments

Jonathan Corbet April 30, 2019, 12:34 p.m. UTC | #1
On Fri, 26 Apr 2019 11:04:29 -0700
<rcampbell@nvidia.com> wrote:

> From: Ralph Campbell <rcampbell@nvidia.com>
> 
> Some minor wording changes and typo corrections.
> 
> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
> Acked-by: Randy Dunlap <rdunlap@infradead.org>
> Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>

Applied, thanks.

jon

Patch
diff mbox series

diff --git a/Documentation/vm/hugetlbfs_reserv.rst b/Documentation/vm/hugetlbfs_reserv.rst
index 9d200762114f..f143954e0d05 100644
--- a/Documentation/vm/hugetlbfs_reserv.rst
+++ b/Documentation/vm/hugetlbfs_reserv.rst
@@ -85,10 +85,10 @@  Reservation Map Location (Private or Shared)
 A huge page mapping or segment is either private or shared.  If private,
 it is typically only available to a single address space (task).  If shared,
 it can be mapped into multiple address spaces (tasks).  The location and
-semantics of the reservation map is significantly different for two types
+semantics of the reservation map is significantly different for the two types
 of mappings.  Location differences are:
 
-- For private mappings, the reservation map hangs off the the VMA structure.
+- For private mappings, the reservation map hangs off the VMA structure.
   Specifically, vma->vm_private_data.  This reserve map is created at the
   time the mapping (mmap(MAP_PRIVATE)) is created.
 - For shared mappings, the reservation map hangs off the inode.  Specifically,
@@ -109,15 +109,15 @@  These operations result in a call to the routine hugetlb_reserve_pages()::
 				  struct vm_area_struct *vma,
 				  vm_flags_t vm_flags)
 
-The first thing hugetlb_reserve_pages() does is check for the NORESERVE
+The first thing hugetlb_reserve_pages() does is check if the NORESERVE
 flag was specified in either the shmget() or mmap() call.  If NORESERVE
-was specified, then this routine returns immediately as no reservation
+was specified, then this routine returns immediately as no reservations
 are desired.
 
 The arguments 'from' and 'to' are huge page indices into the mapping or
 underlying file.  For shmget(), 'from' is always 0 and 'to' corresponds to
 the length of the segment/mapping.  For mmap(), the offset argument could
-be used to specify the offset into the underlying file.  In such a case
+be used to specify the offset into the underlying file.  In such a case,
 the 'from' and 'to' arguments have been adjusted by this offset.
 
 One of the big differences between PRIVATE and SHARED mappings is the way
@@ -138,7 +138,8 @@  to indicate this VMA owns the reservations.
 
 The reservation map is consulted to determine how many huge page reservations
 are needed for the current mapping/segment.  For private mappings, this is
-always the value (to - from).  However, for shared mappings it is possible that some reservations may already exist within the range (to - from).  See the
+always the value (to - from).  However, for shared mappings it is possible that
+some reservations may already exist within the range (to - from).  See the
 section :ref:`Reservation Map Modifications <resv_map_modifications>`
 for details on how this is accomplished.
 
@@ -165,7 +166,7 @@  these counters.
 If there were enough free huge pages and the global count resv_huge_pages
 was adjusted, then the reservation map associated with the mapping is
 modified to reflect the reservations.  In the case of a shared mapping, a
-file_region will exist that includes the range 'from' 'to'.  For private
+file_region will exist that includes the range 'from' - 'to'.  For private
 mappings, no modifications are made to the reservation map as lack of an
 entry indicates a reservation exists.
 
@@ -239,7 +240,7 @@  subpool accounting when the page is freed.
 The routine vma_commit_reservation() is then called to adjust the reserve
 map based on the consumption of the reservation.  In general, this involves
 ensuring the page is represented within a file_region structure of the region
-map.  For shared mappings where the the reservation was present, an entry
+map.  For shared mappings where the reservation was present, an entry
 in the reserve map already existed so no change is made.  However, if there
 was no reservation in a shared mapping or this was a private mapping a new
 entry must be created.
diff --git a/Documentation/vm/transhuge.rst b/Documentation/vm/transhuge.rst
index 8df380657430..37c57ca32629 100644
--- a/Documentation/vm/transhuge.rst
+++ b/Documentation/vm/transhuge.rst
@@ -4,8 +4,9 @@ 
 Transparent Hugepage Support
 ============================
 
-This document describes design principles Transparent Hugepage (THP)
-Support and its interaction with other parts of the memory management.
+This document describes design principles for Transparent Hugepage (THP)
+support and its interaction with other parts of the memory management
+system.
 
 Design principles
 =================
@@ -37,23 +38,23 @@  get_user_pages and follow_page
 
 get_user_pages and follow_page if run on a hugepage, will return the
 head or tail pages as usual (exactly as they would do on
-hugetlbfs). Most gup users will only care about the actual physical
+hugetlbfs). Most GUP users will only care about the actual physical
 address of the page and its temporary pinning to release after the I/O
 is complete, so they won't ever notice the fact the page is huge. But
 if any driver is going to mangle over the page structure of the tail
 page (like for checking page->mapping or other bits that are relevant
 for the head page and not the tail page), it should be updated to jump
-to check head page instead. Taking reference on any head/tail page would
-prevent page from being split by anyone.
+to check head page instead. Taking a reference on any head/tail page would
+prevent the page from being split by anyone.
 
 .. note::
    these aren't new constraints to the GUP API, and they match the
-   same constrains that applies to hugetlbfs too, so any driver capable
+   same constraints that apply to hugetlbfs too, so any driver capable
    of handling GUP on hugetlbfs will also work fine on transparent
    hugepage backed mappings.
 
 In case you can't handle compound pages if they're returned by
-follow_page, the FOLL_SPLIT bit can be specified as parameter to
+follow_page, the FOLL_SPLIT bit can be specified as a parameter to
 follow_page, so that it will split the hugepages before returning
 them.
 
@@ -66,11 +67,11 @@  pmd_offset. It's trivial to make the code transparent hugepage aware
 by just grepping for "pmd_offset" and adding split_huge_pmd where
 missing after pmd_offset returns the pmd. Thanks to the graceful
 fallback design, with a one liner change, you can avoid to write
-hundred if not thousand of lines of complex code to make your code
+hundreds if not thousands of lines of complex code to make your code
 hugepage aware.
 
 If you're not walking pagetables but you run into a physical hugepage
-but you can't handle it natively in your code, you can split it by
+that you can't handle natively in your code, you can split it by
 calling split_huge_page(page). This is what the Linux VM does before
 it tries to swapout the hugepage for example. split_huge_page() can fail
 if the page is pinned and you must handle this correctly.
@@ -97,18 +98,18 @@  split_huge_page() or split_huge_pmd() has a cost.
 
 To make pagetable walks huge pmd aware, all you need to do is to call
 pmd_trans_huge() on the pmd returned by pmd_offset. You must hold the
-mmap_sem in read (or write) mode to be sure an huge pmd cannot be
+mmap_sem in read (or write) mode to be sure a huge pmd cannot be
 created from under you by khugepaged (khugepaged collapse_huge_page
 takes the mmap_sem in write mode in addition to the anon_vma lock). If
 pmd_trans_huge returns false, you just fallback in the old code
 paths. If instead pmd_trans_huge returns true, you have to take the
 page table lock (pmd_lock()) and re-run pmd_trans_huge. Taking the
-page table lock will prevent the huge pmd to be converted into a
+page table lock will prevent the huge pmd being converted into a
 regular pmd from under you (split_huge_pmd can run in parallel to the
 pagetable walk). If the second pmd_trans_huge returns false, you
 should just drop the page table lock and fallback to the old code as
-before. Otherwise you can proceed to process the huge pmd and the
-hugepage natively. Once finished you can drop the page table lock.
+before. Otherwise, you can proceed to process the huge pmd and the
+hugepage natively. Once finished, you can drop the page table lock.
 
 Refcounts and transparent huge pages
 ====================================
@@ -116,61 +117,61 @@  Refcounts and transparent huge pages
 Refcounting on THP is mostly consistent with refcounting on other compound
 pages:
 
-  - get_page()/put_page() and GUP operate in head page's ->_refcount.
+  - get_page()/put_page() and GUP operate on head page's ->_refcount.
 
   - ->_refcount in tail pages is always zero: get_page_unless_zero() never
-    succeed on tail pages.
+    succeeds on tail pages.
 
   - map/unmap of the pages with PTE entry increment/decrement ->_mapcount
     on relevant sub-page of the compound page.
 
-  - map/unmap of the whole compound page accounted in compound_mapcount
+  - map/unmap of the whole compound page is accounted for in compound_mapcount
     (stored in first tail page). For file huge pages, we also increment
     ->_mapcount of all sub-pages in order to have race-free detection of
     last unmap of subpages.
 
 PageDoubleMap() indicates that the page is *possibly* mapped with PTEs.
 
-For anonymous pages PageDoubleMap() also indicates ->_mapcount in all
+For anonymous pages, PageDoubleMap() also indicates ->_mapcount in all
 subpages is offset up by one. This additional reference is required to
 get race-free detection of unmap of subpages when we have them mapped with
 both PMDs and PTEs.
 
-This is optimization required to lower overhead of per-subpage mapcount
-tracking. The alternative is alter ->_mapcount in all subpages on each
+This optimization is required to lower the overhead of per-subpage mapcount
+tracking. The alternative is to alter ->_mapcount in all subpages on each
 map/unmap of the whole compound page.
 
-For anonymous pages, we set PG_double_map when a PMD of the page got split
-for the first time, but still have PMD mapping. The additional references
-go away with last compound_mapcount.
+For anonymous pages, we set PG_double_map when a PMD of the page is split
+for the first time, but still have a PMD mapping. The additional references
+go away with the last compound_mapcount.
 
-File pages get PG_double_map set on first map of the page with PTE and
-goes away when the page gets evicted from page cache.
+File pages get PG_double_map set on the first map of the page with PTE and
+goes away when the page gets evicted from the page cache.
 
 split_huge_page internally has to distribute the refcounts in the head
 page to the tail pages before clearing all PG_head/tail bits from the page
 structures. It can be done easily for refcounts taken by page table
-entries. But we don't have enough information on how to distribute any
+entries, but we don't have enough information on how to distribute any
 additional pins (i.e. from get_user_pages). split_huge_page() fails any
-requests to split pinned huge page: it expects page count to be equal to
-sum of mapcount of all sub-pages plus one (split_huge_page caller must
-have reference for head page).
+requests to split pinned huge pages: it expects page count to be equal to
+the sum of mapcount of all sub-pages plus one (split_huge_page caller must
+have a reference to the head page).
 
 split_huge_page uses migration entries to stabilize page->_refcount and
-page->_mapcount of anonymous pages. File pages just got unmapped.
+page->_mapcount of anonymous pages. File pages just get unmapped.
 
-We safe against physical memory scanners too: the only legitimate way
-scanner can get reference to a page is get_page_unless_zero().
+We are safe against physical memory scanners too: the only legitimate way
+a scanner can get a reference to a page is get_page_unless_zero().
 
 All tail pages have zero ->_refcount until atomic_add(). This prevents the
 scanner from getting a reference to the tail page up to that point. After the
-atomic_add() we don't care about the ->_refcount value. We already known how
+atomic_add() we don't care about the ->_refcount value. We already know how
 many references should be uncharged from the head page.
 
 For head page get_page_unless_zero() will succeed and we don't mind. It's
-clear where reference should go after split: it will stay on head page.
+clear where references should go after split: it will stay on the head page.
 
-Note that split_huge_pmd() doesn't have any limitation on refcounting:
+Note that split_huge_pmd() doesn't have any limitations on refcounting:
 pmd can be split at any point and never fails.
 
 Partial unmap and deferred_split_huge_page()
@@ -182,10 +183,10 @@  in page_remove_rmap() and queue the THP for splitting if memory pressure
 comes. Splitting will free up unused subpages.
 
 Splitting the page right away is not an option due to locking context in
-the place where we can detect partial unmap. It's also might be
+the place where we can detect partial unmap. It also might be
 counterproductive since in many cases partial unmap happens during exit(2) if
 a THP crosses a VMA boundary.
 
-Function deferred_split_huge_page() is used to queue page for splitting.
+The function deferred_split_huge_page() is used to queue a page for splitting.
 The splitting itself will happen when we get memory pressure via shrinker
 interface.