From: Duy Nguyen <pclouds@gmail.com>
To: David Turner <dturner@twopensource.com>
Cc: Git Mailing List <git@vger.kernel.org>
Subject: Re: [PATCH v5 02/15] read-cache: allow to keep mmap'd memory after reading
Date: Wed, 20 Apr 2016 16:26:34 +0700 [thread overview]
Message-ID: <CACsJy8D229ARqEjH29Gqd=u8KijGA_Fzk0cbUNRXB9GA0ittMg@mail.gmail.com> (raw)
In-Reply-To: <1461108489-29376-3-git-send-email-dturner@twopensource.com>
On Wed, Apr 20, 2016 at 6:27 AM, David Turner <dturner@twopensource.com> wrote:
> From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
>
> Later, we will introduce git index-helper to share this memory with
> other git processes.
>
> Since the memory will be shared, it will never be unmapped (although
> the kernel may of course choose to page it out).
This is not entirely true. We do need to keep the mmap'd memory for
longer, even after read_index_from() finishes. But we do not share the
exact same address space to other processes (memcpy is used in
index-helper.c:share_index()). We could even discard_index() at the
end of share_index(), but I think we keep it anyway just in case
another process asks, or when index is not updated.
--
Duy
next prev parent reply other threads:[~2016-04-20 9:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-19 23:27 [PATCH v5 00/15] index-helper/watchman David Turner
2016-04-19 23:27 ` [PATCH v5 01/15] read-cache.c: fix constness of verify_hdr() David Turner
2016-04-19 23:27 ` [PATCH v5 02/15] read-cache: allow to keep mmap'd memory after reading David Turner
2016-04-20 9:01 ` Johannes Schindelin
2016-04-20 19:41 ` David Turner
2016-04-20 9:26 ` Duy Nguyen [this message]
2016-04-20 19:43 ` David Turner
2016-04-19 23:27 ` [PATCH v5 03/15] index-helper: new daemon for caching index and related stuff David Turner
2016-04-20 12:17 ` Johannes Schindelin
2016-04-20 12:31 ` Duy Nguyen
2016-04-20 19:38 ` David Turner
2016-04-19 23:27 ` [PATCH v5 04/15] index-helper: add --strict David Turner
2016-04-19 23:27 ` [PATCH v5 05/15] daemonize(): set a flag before exiting the main process David Turner
2016-04-19 23:28 ` [PATCH v5 06/15] index-helper: add --detach David Turner
2016-04-19 23:50 ` Duy Nguyen
2016-04-20 1:04 ` David Turner
2016-04-20 9:33 ` Duy Nguyen
2016-04-25 20:53 ` David Turner
2016-04-19 23:28 ` [PATCH v5 07/15] read-cache: add watchman 'WAMA' extension David Turner
2016-04-19 23:28 ` [PATCH v5 08/15] Add watchman support to reduce index refresh cost David Turner
2016-04-19 23:28 ` [PATCH v5 09/15] index-helper: use watchman to avoid refreshing index with lstat() David Turner
2016-04-20 0:15 ` Duy Nguyen
2016-04-20 1:01 ` David Turner
2016-04-20 9:36 ` Duy Nguyen
2016-04-19 23:28 ` [PATCH v5 10/15] update-index: enable/disable watchman support David Turner
2016-04-19 23:45 ` Duy Nguyen
2016-04-20 19:50 ` David Turner
2016-04-19 23:28 ` [PATCH v5 11/15] unpack-trees: preserve index extensions David Turner
2016-04-19 23:28 ` [PATCH v5 12/15] index-helper: kill mode David Turner
2016-04-19 23:28 ` [PATCH v5 13/15] index-helper: don't run if already running David Turner
2016-04-19 23:28 ` [PATCH v5 14/15] index-helper: autorun mode David Turner
2016-04-19 23:28 ` [PATCH v5 15/15] index-helper: optionally automatically run David Turner
2016-04-20 9:59 ` [PATCH 16/15] Add tracing to measure where most of the time is spent Nguyễn Thái Ngọc Duy
2016-04-20 12:28 ` Johannes Schindelin
2016-04-20 12:36 ` Duy Nguyen
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
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CACsJy8D229ARqEjH29Gqd=u8KijGA_Fzk0cbUNRXB9GA0ittMg@mail.gmail.com' \
--to=pclouds@gmail.com \
--cc=dturner@twopensource.com \
--cc=git@vger.kernel.org \
/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.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).