From: Daniel Jordan <daniel.m.jordan@oracle.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>,
John Hubbard <jhubbard@nvidia.com>,
linux-mm@kvack.org, hughd@google.com,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Zi Yan <ziy@nvidia.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/vmstat: Add events for PMD based THP migration without split
Date: Wed, 3 Jun 2020 12:08:28 -0400 [thread overview]
Message-ID: <20200603160828.2sfuyjpyyc2bpuan@ca-dmjordan1.us.oracle.com> (raw)
In-Reply-To: <db50792c-ced5-a59d-0d94-e1520cf53715@arm.com>
On Wed, Jun 03, 2020 at 10:06:31AM +0530, Anshuman Khandual wrote:
> Does this look okay and sufficient ?
>
> --- a/Documentation/vm/page_migration.rst
> +++ b/Documentation/vm/page_migration.rst
> @@ -253,5 +253,20 @@ which are function pointers of struct address_space_operations.
> PG_isolated is alias with PG_reclaim flag so driver shouldn't use the flag
> for own purpose.
>
> +Quantifying Migration
> +=====================
> +Following events can be used to quantify page migration.
> +
> +- PGMIGRATE_SUCCESS
> +- PGMIGRATE_FAIL
> +- THP_MIGRATION_SUCCESS
> +- THP_MIGRATION_FAILURE
> +
> +THP_MIGRATION_FAILURE in particular represents an event when a THP could not be
> +migrated as a single entity following an allocation failure and ended up getting
> +split into constituent normal pages before being retried. This event, along with
> +PGMIGRATE_SUCCESS and PGMIGRATE_FAIL will help in quantifying and analyzing THP
> +migration events including both success and failure cases.
Looks great!
> Sure, will update the commit message accordingly.
Thanks. Hopefully these will help someone in the future.
next prev parent reply other threads:[~2020-06-03 16:10 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-22 3:34 Anshuman Khandual
2020-06-01 16:57 ` Daniel Jordan
2020-06-02 3:20 ` John Hubbard
2020-06-02 4:20 ` Anshuman Khandual
2020-06-02 4:48 ` John Hubbard
2020-06-02 5:30 ` Anshuman Khandual
2020-06-02 14:52 ` Daniel Jordan
2020-06-03 4:36 ` Anshuman Khandual
2020-06-03 16:08 ` Daniel Jordan [this message]
2020-06-02 15:01 ` Matthew Wilcox
2020-06-03 1:26 ` Anshuman Khandual
2020-06-03 2:57 ` Matthew Wilcox
2020-06-03 4:58 ` Anshuman Khandual
2020-06-03 11:09 ` Matthew Wilcox
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200603160828.2sfuyjpyyc2bpuan@ca-dmjordan1.us.oracle.com \
--to=daniel.m.jordan@oracle.com \
--cc=akpm@linux-foundation.org \
--cc=anshuman.khandual@arm.com \
--cc=hughd@google.com \
--cc=jhubbard@nvidia.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox