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Date: Sat, 18 Feb 2023 00:28:14 +0000
From: James Houghton <jthoughton@...gle.com>
To: Mike Kravetz <mike.kravetz@...cle.com>,
Muchun Song <songmuchun@...edance.com>,
Peter Xu <peterx@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
David Rientjes <rientjes@...gle.com>,
Axel Rasmussen <axelrasmussen@...gle.com>,
Mina Almasry <almasrymina@...gle.com>,
"Zach O'Keefe" <zokeefe@...gle.com>,
Manish Mishra <manish.mishra@...anix.com>,
Naoya Horiguchi <naoya.horiguchi@....com>,
"Dr . David Alan Gilbert" <dgilbert@...hat.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Vlastimil Babka <vbabka@...e.cz>,
Baolin Wang <baolin.wang@...ux.alibaba.com>,
Miaohe Lin <linmiaohe@...wei.com>,
Yang Shi <shy828301@...il.com>,
Frank van der Linden <fvdl@...gle.com>,
Jiaqi Yan <jiaqiyan@...gle.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
James Houghton <jthoughton@...gle.com>
Subject: [PATCH v2 41/46] docs: proc: include information about HugeTLB HGM
Include the updates that have been made to smaps, specifically,
the addition of Hugetlb[Pud,Pmd,Pte]Mapped.
Signed-off-by: James Houghton <jthoughton@...gle.com>
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index e224b6d5b642..1d2a1cd1fe6a 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -447,29 +447,32 @@ Memory Area, or VMA) there is a series of lines such as the following::
08048000-080bc000 r-xp 00000000 03:02 13130 /bin/bash
- Size: 1084 kB
- KernelPageSize: 4 kB
- MMUPageSize: 4 kB
- Rss: 892 kB
- Pss: 374 kB
- Pss_Dirty: 0 kB
- Shared_Clean: 892 kB
- Shared_Dirty: 0 kB
- Private_Clean: 0 kB
- Private_Dirty: 0 kB
- Referenced: 892 kB
- Anonymous: 0 kB
- LazyFree: 0 kB
- AnonHugePages: 0 kB
- ShmemPmdMapped: 0 kB
- Shared_Hugetlb: 0 kB
- Private_Hugetlb: 0 kB
- Swap: 0 kB
- SwapPss: 0 kB
- KernelPageSize: 4 kB
- MMUPageSize: 4 kB
- Locked: 0 kB
- THPeligible: 0
+ Size: 1084 kB
+ KernelPageSize: 4 kB
+ MMUPageSize: 4 kB
+ Rss: 892 kB
+ Pss: 374 kB
+ Pss_Dirty: 0 kB
+ Shared_Clean: 892 kB
+ Shared_Dirty: 0 kB
+ Private_Clean: 0 kB
+ Private_Dirty: 0 kB
+ Referenced: 892 kB
+ Anonymous: 0 kB
+ LazyFree: 0 kB
+ AnonHugePages: 0 kB
+ ShmemPmdMapped: 0 kB
+ Shared_Hugetlb: 0 kB
+ Private_Hugetlb: 0 kB
+ HugetlbPudMapped: 0 kB
+ HugetlbPmdMapped: 0 kB
+ HugetlbPteMapped: 0 kB
+ Swap: 0 kB
+ SwapPss: 0 kB
+ KernelPageSize: 4 kB
+ MMUPageSize: 4 kB
+ Locked: 0 kB
+ THPeligible: 0
VmFlags: rd ex mr mw me dw
The first of these lines shows the same information as is displayed for the
@@ -510,10 +513,15 @@ implementation. If this is not desirable please file a bug report.
"ShmemPmdMapped" shows the ammount of shared (shmem/tmpfs) memory backed by
huge pages.
-"Shared_Hugetlb" and "Private_Hugetlb" show the ammounts of memory backed by
+"Shared_Hugetlb" and "Private_Hugetlb" show the amounts of memory backed by
hugetlbfs page which is *not* counted in "RSS" or "PSS" field for historical
reasons. And these are not included in {Shared,Private}_{Clean,Dirty} field.
+If the kernel was compiled with ``CONFIG_HUGETLB_HIGH_GRANULARITY_MAPPING``,
+"HugetlbPudMapped", "HugetlbPmdMapped", and "HugetlbPteMapped" may appear and
+show the amount of HugeTLB memory mapped with PUDs, PMDs, and PTEs respectively.
+Folded levels won't appear. See Documentation/admin-guide/mm/hugetlbpage.rst.
+
"Swap" shows how much would-be-anonymous memory is also used, but out on swap.
For shmem mappings, "Swap" includes also the size of the mapped (and not
--
2.39.2.637.g21b0678d19-goog
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