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src,lib: expose memory file mapping flag #29260

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src,lib: expose memory file mapping flag #29260

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joaocgreis
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Support for UV_FS_O_FILEMAP was added in libuv in version 1.31.0. This exposes the flag in fs.constants and adds the prefix 'm' for text flags.

New functionality is added, so this is semver minor.

cc @nodejs/platform-windows

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@joaocgreis
src,lib: expose memory file mapping flag
2002dd1 
Support for UV_FS_O_FILEMAP was added in libuv in version 1.31.0.
This exposes the flag in fs.constants and adds the prefix 'm' for
text flags.
@joaocgreis joaocgreis added the semver-minor PRs that contain new features and should be released in the next minor version. label Aug 22, 2019
@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. fs Issues and PRs related to the fs subsystem / file system. labels Aug 22, 2019
@Trott
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Trott commented Aug 22, 2019

@nodejs/fs @nodejs/libuv

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CI: https://ci.nodejs.org/job/node-test-pull-request/25170/

mscdex
mscdex reviewed Aug 22, 2019
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Trott
Trott reviewed Aug 22, 2019
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bnoordhuis
bnoordhuis approved these changes Aug 22, 2019
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LGTM with suggestions.

Question: is e.g. 'ma' (memory-mapped, append-only) a mode that makes sense?

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Thanks for the reviews! Updated.

Question: is e.g. 'ma' (memory-mapped, append-only) a mode that makes sense?

I tried to keep the libuv API as compatible as possible. This included supporting positional writes and keeping track of the file position. On top of this, supporting append makes sense to me, and it was not that complex:

node/deps/uv/src/win/fs.c

Lines 934 to 935 in 775048d

if (force_append) {
pos = fd_info->size;

Making multiple appends to the same file is much slower than without using a file mapping though, because the mapping has to be re-created to enlarge the file every time.

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I did some research and it seems mmap() on an O_APPEND file descriptor fails with EACCES on most Unices (which makes sense to me.)

I think we should revisit the libuv behavior and drop the 'ma' flags from this pull request.

@joaocgreis joaocgreis mentioned this pull request Sep 2, 2019
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@bnoordhuis removed the 'm' flags from this PR. Opened libuv/libuv#2448 to discuss the libuv side.

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LGTM. The 'mr' and 'mw' flags would still have been alright but those can always be added later.

jasnell
jasnell reviewed Sep 3, 2019
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@jasnell updated, PTAL.

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@jasnell any objection for landing this?

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nodejs-github-bot commented Sep 11, 2019 •
edited by joaocgreis
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CI: https://ci.nodejs.org/job/node-test-pull-request/25432/ ✔️

joaocgreis added a commit that referenced this pull request Sep 11, 2019
@joaocgreis
src,lib: expose memory file mapping flag
902c9fa 
Support for UV_FS_O_FILEMAP was added in libuv in version 1.31.0.
This exposes the flag in fs.constants.

Refs: libuv/libuv#2295
PR-URL: #29260
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ron Korving <ron@ronkorving.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
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Landed in 902c9fa

@joaocgreis joaocgreis closed this Sep 11, 2019
@joaocgreis joaocgreis mentioned this pull request Sep 12, 2019
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@joaocgreis joaocgreis mentioned this pull request Sep 12, 2019
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targos pushed a commit that referenced this pull request Sep 20, 2019
@joaocgreis @targos
src,lib: expose memory file mapping flag
465bc66 
Support for UV_FS_O_FILEMAP was added in libuv in version 1.31.0.
This exposes the flag in fs.constants.

Refs: libuv/libuv#2295
PR-URL: #29260
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ron Korving <ron@ronkorving.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
BridgeAR added a commit that referenced this pull request Sep 24, 2019
@BridgeAR
2019-09-24, Version 12.11.0 (Current)
21e8f36 
Notable changes:

* crypto:
  * Add `oaepLabel` option #29489
* deps:
  * Update V8 to 7.7.299.11 #28918
    * More efficient memory handling
    * Stack trace serialization got faster
    * The `Intl.NumberFormat` API gained new functionality
    * For more information: https://v8.dev/blog/v8-release-77
* events:
  * Add support for `EventTarget` in `once`
    #29498
* fs:
  * Expose memory file mapping flag `UV_FS_O_FILEMAP`
    #29260
* inspector:
  * New API - `Session.connectToMainThread`
    #28870
* process:
  * Initial SourceMap support via `env.NODE_V8_COVERAGE`
    #28960
* stream:
  * Make `_write()` optional when `_writev()` is implemented
    #29639
* tls:
  * Add option to override signature algorithms
    #29598
* util:
  * Add `encodeInto` to `TextEncoder`
    #29524
* worker:
  * The `worker_thread` module is now stable
    #29512
@BridgeAR BridgeAR mentioned this pull request Sep 24, 2019
Merged
joaocgreis added a commit to JaneaSystems/node that referenced this pull request Sep 24, 2019
@joaocgreis
src,lib: expose memory file mapping flag
6f40aa9 
Support for UV_FS_O_FILEMAP was added in libuv in version 1.31.0.
This exposes the flag in fs.constants.

Refs: libuv/libuv#2295
PR-URL: nodejs#29260
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ron Korving <ron@ronkorving.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
BridgeAR pushed a commit that referenced this pull request Sep 25, 2019
@joaocgreis @BridgeAR
src,lib: expose memory file mapping flag
78af92d 
Support for UV_FS_O_FILEMAP was added in libuv in version 1.31.0.
This exposes the flag in fs.constants.

Refs: libuv/libuv#2295
PR-URL: #29260
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Ron Korving <ron@ronkorving.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
BridgeAR added a commit that referenced this pull request Sep 25, 2019
@BridgeAR
2019-09-24, Version 12.11.0 (Current)
b50c01c 
Notable changes:

* crypto:
  * Add `oaepLabel` option #29489
* deps:
  * Update V8 to 7.7.299.11 #28918
    * More efficient memory handling
    * Stack trace serialization got faster
    * The `Intl.NumberFormat` API gained new functionality
    * For more information: https://v8.dev/blog/v8-release-77
* events:
  * Add support for `EventTarget` in `once`
    #29498
* fs:
  * Expose memory file mapping flag `UV_FS_O_FILEMAP`
    #29260
* inspector:
  * New API - `Session.connectToMainThread`
    #28870
* process:
  * Initial SourceMap support via `env.NODE_V8_COVERAGE`
    #28960
* stream:
  * Make `_write()` optional when `_writev()` is implemented
    #29639
* tls:
  * Add option to override signature algorithms
    #29598
* util:
  * Add `encodeInto` to `TextEncoder`
    #29524
* worker:
  * The `worker_thread` module is now stable
    #29512

PR-URL: #29695
BridgeAR added a commit that referenced this pull request Sep 25, 2019
@BridgeAR
2019-09-24, Version 12.11.0 (Current)
d36b6f8 
Notable changes:

* crypto:
  * Add `oaepLabel` option #29489
* deps:
  * Update V8 to 7.7.299.11 #28918
    * More efficient memory handling
    * Stack trace serialization got faster
    * The `Intl.NumberFormat` API gained new functionality
    * For more information: https://v8.dev/blog/v8-release-77
* events:
  * Add support for `EventTarget` in `once`
    #29498
* fs:
  * Expose memory file mapping flag `UV_FS_O_FILEMAP`
    #29260
* inspector:
  * New API - `Session.connectToMainThread`
    #28870
* process:
  * Initial SourceMap support via `env.NODE_V8_COVERAGE`
    #28960
* stream:
  * Make `_write()` optional when `_writev()` is implemented
    #29639
* tls:
  * Add option to override signature algorithms
    #29598
* util:
  * Add `encodeInto` to `TextEncoder`
    #29524
* worker:
  * The `worker_thread` module is now stable
    #29512

PR-URL: #29695
This was referenced Sep 25, 2019
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@ronkorving ronkorving ronkorving approved these changes

@jasnell jasnell jasnell approved these changes

@bnoordhuis bnoordhuis bnoordhuis approved these changes

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