Re: [PATCH] mm: anonymous shared memory naming

Bagas Sanjaya
2022-11-05T09:34:12Z

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On Sat, Nov 05, 2022 at 02:53:42AM +0000, Pasha Tatashin wrote:
> Since:
> commit 9a10064f5625 ("mm: add a field to store names for private anonymous
> memory")
>
> We can set names for private anonymous memory but not for shared
> anonymous memory. However, naming shared anonymous memory just as
> useful for tracking purposes.
>

Who are "we"?

Instead, say "Since commit <commit>, name for private anonymous memory,
but not shared anonymous, can be set".

> @@ -431,8 +431,10 @@ is not associated with a file:
> [stack] the stack of the main process
> [vdso] the "virtual dynamic shared object",
> the kernel system call handler
> - [anon:<name>] an anonymous mapping that has been
> + [anon:<name>] a private anonymous mapping that has been
> named by userspace
> + path [anon_shmem:<name>] an anonymous shared memory mapping that has
> + been named by userspace
> ============= ====================================
>

The table above triggers Sphinx warning:

Documentation/filesystems/proc.rst:436: WARNING: Malformed table.
Text in column margin in table line 8.

============= ====================================
[heap] the heap of the program
[stack] the stack of the main process
[vdso] the "virtual dynamic shared object",
the kernel system call handler
[anon:<name>] a private anonymous mapping that has been
named by userspace
path [anon_shmem:<name>] an anonymous shared memory mapping that has
been named by userspace
============= ====================================

I have applied the fixup:

---- >8 ----

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 8f1e68460da5cd..3f17b4ef307fe4 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -426,7 +426,7 @@ with the memory region, as the case would be with BSS (uninitialized data).
The "pathname" shows the name associated file for this mapping. If the mapping
is not associated with a file:

- ============= ====================================
+ ======================== ===========================================
[heap] the heap of the program
[stack] the stack of the main process
[vdso] the "virtual dynamic shared object",
@@ -435,7 +435,7 @@ is not associated with a file:
named by userspace
path [anon_shmem:<name>] an anonymous shared memory mapping that has
been named by userspace
- ============= ====================================
+ ======================== ===========================================

or if empty, the mapping is anonymous.

Thanks.

--
An old man doll... just what I always wanted! - Clara

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