Large Page Support for Code Issue: 16198 #21064

suresh-srinivas · 2018-05-31T20:22:42Z

Support under Linux to map the text segment of node into 2M pages.
Fixes: #16198
src: node.cc,node_large_page.cc,node_large_page.h
build: node.gyp,node.gypi,ld.implicit.script
config: configure

How to enable
./configure --use-largepages

Performance Results

Node Microbenchmarks (under node/benchmarks)
total tests | 5444
total 3 stars | 589 with 82% of tests showing positive gains and 18% have low single digit regression.

Node Larger Application

Web Tooling - 2%
Node-DC-EIS - 3% - 5%
Ghost - 2% - 3%
Node-Todo - 20%
React-SSR - 2.5%

Caveats

Tested under Ubuntu 16.04 only
Original PR had 3 tests failing. The latest updated PR has no tests failing.
Short running programs will see slowdown due to additional code (~450k x86 instructions) during startup

Checklist

make -j4 test (UNIX), passes
tests and/or benchmarks are included (details above)
Code follows Node C++ Style Guide
commit message follows commit guidelines

…s are enabled

Increased number of Pages to be mapped

Changes to be committed: modified: src/node_large_page.cc

… enable node_use_large_pages=true in configure and protect the node_large_page.cc and the link using node_use_large_pages

… condition

…remapped region

…LO/node into intel-large-pages

src: node.cc,node_large_page.cc,node_large_page.h build: node.gyp,node.gypi,ld.script config: configure

…s/node into intel-large-pages

gireeshpunathil · 2018-06-01T04:43:38Z

ld.script

+/* Copyright (C) 2014-2015 Free Software Foundation, Inc.
+   Copying and distribution of this script, with or without modification,
+   are permitted in any medium without royalty provided the copyright
+   notice and this notice are preserved.  */


too low level for me to review, how do we make sure its correctness? are there documentations around this?

There were 3 line modification to the default ld.script to create a variable name(s) for the start of actual node text segment.

PROVIDE (__nodetext = .); PROVIDE (_nodetext = .); PROVIDE (nodetext = .);

gireeshpunathil · 2018-06-01T04:44:14Z

src/node.cc

+  }
+#endif
+
+


any reason why we are doing it here, as opposed to the very beginning of everything, in main?

No particular reason. This was a place where other things were initialized like VTune support.

gireeshpunathil · 2018-06-01T04:44:26Z

src/node.cc

@@ -4420,6 +4431,7 @@ int Start(int argc, char** argv) {
  // will never be fully cleaned up.
  v8_platform.Dispose();

+


extra line?

Thanks will fix that.

gireeshpunathil · 2018-06-01T04:45:10Z

src/node_large_page.cc

+extern char __nodetext;
+
+namespace node {
+namespace largepages {


not sure this qualifies for a separate namespace.

Sure. I wanted the structure and code to live in a separate space and not pollute the node space.

gireeshpunathil · 2018-06-01T04:45:33Z

src/node_large_page.cc

+  int64_t  offset;
+  bool   found_text_region;
+};
+


how many of these fields are used?
can we follow a consistent variable naming convention? (camel casing vs snake casing etc.) I suggest look around in node.cc for the prevailing nomenclature.

Sure, will look and make it consistent.

gireeshpunathil · 2018-06-01T04:47:16Z

src/node_large_page.cc

+        }
+      }
+
+      return nregion;


the frame will be overwritten after return, so the local structure will be stale in the caller?

We are not returning a pointer to this but the actual structure which will be returned as a copy. So we are ok.

sorry for that, my mis-understanding.

gireeshpunathil · 2018-06-01T04:47:29Z

src/node_large_page.cc

+    }
+
+    static bool isTransparentHugePagesEnabled() {
+       std::ifstream ifs;


any reason for using C++ style file I/O and C style elsewhere?

Will make it consistent and use C++ everywhere.

gireeshpunathil · 2018-06-01T04:47:50Z

src/node_large_page.cc

+
+        memcpy(nmem, r.from, size);
+
+        tmem = mmap(start, size,


what are the chances you get what you want at the same location? start is already mapped, right? how about passing a nullptr here and get the huge pages wherever available?

If addr is not NULL, then the kernel takes it as a hint about where to place the mapping. Since we are using MAP_FIXED it is not a hint but a requirement. We are relying on the new mapping being at the same virtual address so we dont have to do any fix up of the code. Otherwise we will have to fixup the branches, offsets etc.

ok - I was thinking on the lines on mremap , but looking at the man page for that and your implementation, I guess it is one and the same.

gireeshpunathil · 2018-06-01T04:48:04Z

src/node_large_page.cc

+
+        tmem = mmap(start, size,
+                    PROT_READ | PROT_WRITE | PROT_EXEC,
+                    MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1 , 0);


what is the rationale behind predefining the memory attributes? ideally we want to inherit the attribute from the old small pages?

We do want to be able to write to this so PROT_WRITE is needed. We are using MAP_FIXED to place the mapping at exactly that address.

Updated the code comments
We already know the original page is r-xp (PROT_READ, PROT_EXEC, MAP_PRIVATE)
We want PROT_WRITE because we are writing into it.
We want it at the fixed address and we use MAP_FIXED.
We are using MAP_ANONYMOUS so it's contents are initialized to zero and it is also not backed by any file.

gireeshpunathil · 2018-06-01T04:48:30Z

src/node_large_page.cc

+       ifs.open("/sys/kernel/mm/transparent_hugepage/enabled");
+       if (!ifs) {
+         fprintf(stderr, "WARNING: Couldn't check hugepages support\n");
+         return false;


can we follow a consistent return value convention? (returning null vs. -1 vs errno) I suggest look arounf in other APIs for the prevailing convention.

suresh-srinivas · 2018-06-01T17:13:17Z

@gireeshpunathil thanks for the review and feedback. We will work on updating the PR with those suggestions. Let me know if you have any other questions.

suresh-srinivas · 2018-06-02T00:26:21Z

@gireeshpunathil the PR is updated based on the feedback. Would appreciate if you could take a look.

bnoordhuis · 2018-06-02T17:24:13Z

configure

+    if options.node_use_large_pages:
+      o['variables']['node_use_large_pages'] = 'true'
+    else:
+      o['variables']['node_use_large_pages'] = 'false'


Can be simplified to this:

use_large_pages = (flavor == 'linux' and options.node_use_large_pages) o['variables']['node_use_large_pages'] = b(use_large_pages)

bnoordhuis · 2018-06-02T17:29:48Z

ld.script

+  .debug_macro    0 : { *(.debug_macro) }
+  .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
+  /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) }
+}


This file can probably be reduced to ~20 lines. It's pretty well hidden in all the definitions but I infer you really only care about the nodetext symbols.

I dont see how it can be reduced to 20 lines. Much of it is what is used by the default linker script. Yes the only reason for me to modify it was to find the start of the actual text. I had trouble with moving the plt regions and wanted to avoid several of those regions.

https://sourceware.org/binutils/docs/ld/Implicit-Linker-Scripts.html#Implicit-Linker-Scripts - instead of replacing the default linker script, you use an implicit linker script that works in addition to the default linker script.

Replacing the default linker script isn't an option, IMO, because that will be a never-ending maintenance hassle for us.

The implicit linker scripts wont really help as I cant do a symbol assignment for something that is already specified in the linker script. I will investigate if there is some other approach to get the address of the .text segment.

I am able eliminate the ld.script by using the LD option -Wl,-Ttext=<address to place text segment>. This places the text segment at a specific address which I can then use as the start for the 2M mapping. This will hard code the text starting address.

The other way is to read the elf file and find the .text segment and determine the address.

A fixed address is bad for security reasons and reading it from the ELF header won't work when ASLR is enabled.

I guess you could compute the ASLR slide at run-time but that gets complicated fast when code and data is spread across several segments.

Another issue with that approach: two segments with different protection might be located within < 2 MB from each other.

Are you sure implicit linker scripts don't work? I remember using that to put symbols at fixed locations.

What about retrieving the path to the default linker script with ld --verbose and passing -T /path/to/default/script.ld -T custom.ld?

Thanks. Let me look into the implicit linker script some more. Another option is to generate the linker script using the ld --verbose and to then add my symbol to it.

I was able to figure this out. GNU ld has the INSERT option which makes the externally supported script not override the default script but insert the code into the default. So I will delete the ld.script and insert a new ld.implicit.script

PROVIDE (_nodetext = .);
PROVIDE (nodetext = .);
INSERT BEFORE .text;

bnoordhuis · 2018-06-02T17:30:58Z

node.gypi

-            ['OS!="aix" and node_shared=="false"', {
+            ['OS!="aix" and node_shared=="false" and node_use_large_pages=="true"', {
+              'ldflags': [
+                 '-Wl,-T <(PRODUCT_DIR)/../../ld.script',


Have you tested this on on other platforms than x86_64 Linux?

No only on x86_64 Linux, specifically Ubuntu 16.04 is what I have done most of my measurement and testing on.

Okay, I figured as much. This needs an additional guard to ensure it's only activated when OS=="linux" and target_arch="x64".

Thanks fixed it.

bnoordhuis · 2018-06-02T17:31:17Z

node.gypi

@@ -348,6 +356,5 @@
    }, {
      'defines': [ 'HAVE_OPENSSL=0' ]
    }],
-
-  ],
+  ]


Stylistic change, please undo.

bnoordhuis · 2018-06-02T17:33:02Z

src/node_large_page.cc

+
+      nregion.found_text_region = false;
+
+      ifs.open("/proc/self/maps");


Assumes /proc is mounted. Not necessarily true.

ok, added checks.

bnoordhuis · 2018-06-02T17:33:59Z

src/node_large_page.cc

+      iss >> permission;
+
+      if (permission.compare("r-xp") == 0) {
+        start = (unsigned int64_t) &__nodetext;


Don't use C style casts, use proper C++ casts (in this case reinterpret_cast<uint64_t>.)

ok fixed that. in fact took out that line and use nodetext directly.

bnoordhuis · 2018-06-02T17:35:28Z

src/node_large_page.cc

+      return isTransparentHugePagesEnabled();
+    }
+
+}  // namespace node


I admit I kinda checked out after the first 100 lines. This file has so many style errors, can you fix those first, please?

Could you be specific? I ran the make -s lint and fixed all the ones pointed to by that.

The linter doesn't catch everything but to name three things:

Inconsistent indentation.

Star leans left in pointers (void* p, not void *p or void * p.)

Casing: IsLargePagesEnabled, not isLargePagesEnabled.

Thanks I have updated the PR with 2) and 3). I am using standard indentation of 2 spaces.

@suresh-srinivas There’s https://github.com/nodejs/node/blob/master/CPP_STYLE_GUIDE.md that would help a lot with this. Also, comparing with other code in our codebase if you’re unsure. :)

(In particular, we don’t indent code inside namespaces)

@addaleax thanks much. I will look at this and fix styles accordingly.

@addaleax @bnoordhuis @gireeshpunathil fixed the style errors. Let me know if you see anything else.

suresh-srinivas · 2018-06-03T16:12:04Z

@bnoordhuis PR updated with the feedback.

…eEnabled instead of isLargePageEnabled)

…ch=x64

i) CamelCase for methods, functions ii) snake_case for variables/structs iii) indentation (dont indent code inside namespace)

gabrielschulhof · 2018-06-07T17:05:43Z

src/node_large_page.h

+#ifndef SRC_NODE_LARGE_PAGE_H_
+#define SRC_NODE_LARGE_PAGE_H_
+
+namespace node {


This should be enclosed in

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

Thanks I fixed it.

GNU ld has the INSERT option which makes the externally supported script not override the default script but insert the code into the default. The new ld.implicit.script does just that and no modification to the default script is necessary anymore. PROVIDE (_nodetext = .); PROVIDE (nodetext = .); INSERT BEFORE .text;

suresh-srinivas · 2018-06-07T19:07:08Z

@gireeshpunathil @bnoordhuis @addaleax @gabrielschulhof @Fishrock123
Thank you all for your excellent suggestions. I really appreciate it. I have addressed them. Could you please review and let me know if there is anything else to address?

The tests were failing due to libgcc_s unwinder getting confused. I was able to debug this problem and linking and using libunwind didnt have any issues. The code MoveTextRegionToLargePages was being placed in eh_frame region initially and this was causing the tests to fail. I now create a new stub region (before .text) in the implicit script and place the MoveTextRegionToLargePages in that region and also ensure that this is ahead of the region we are moving. gdb node info file 0x0000000000a00000 - 0x0000000000a001d3 is .lpstub 0x0000000000a01000 - 0x000000000182a279 is .text

suresh-srinivas · 2018-06-07T19:32:32Z

Fix the test failures. The tests were failing due to libgcc_s unwinder getting confused.
I was able to debug this problem and linking and using libunwind didnt have
any issues. The function MoveTextRegionToLargePages was being placed in eh_frame
region initially and this was causing the tests to fail.

I now create a new stub region .lpstub (before .text) in the implicit script and place the
MoveTextRegionToLargePages in that region and also ensure that this is ahead of the region we are moving.

If you use gdb to inspect node you will see this new region.

`
gdb node
info file
0x0000000000a00000 - 0x0000000000a001d3 is .lpstub
0x0000000000a01000 - 0x000000000182a279 is .text

`
Output from the make test


make -s jstest
  touch 4c9f8dff746263c6b99daae859c3bee760e684cc.intermediate
  LD_LIBRARY_PATH=/home/dslo/node-ssuresh-intel-large-pages/out/Release/lib.host:/home/dslo/node-ssuresh-intel-large-pages/out/Release/lib.target:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../.; mkdir -p /home/dslo/node-ssuresh-intel-large-pages/out/Release/obj/gen/src/node/inspector/protocol; python deps/v8/third_party/inspector_protocol/CodeGenerator.py --jinja_dir deps/v8/third_party/inspector_protocol/.. --output_base "/home/dslo/node-ssuresh-intel-large-pages/out/Release/obj/gen/src/" --config "/home/dslo/node-ssuresh-intel-large-pages/out/Release/obj/gen/node_protocol_config.json"
  touch ed4163f88573b3e267caad3d6690971c08be69d0.intermediate
  LD_LIBRARY_PATH=/home/dslo/node-ssuresh-intel-large-pages/out/Release/lib.host:/home/dslo/node-ssuresh-intel-large-pages/out/Release/lib.target:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../deps/v8/gypfiles; mkdir -p /home/dslo/node-ssuresh-intel-large-pages/out/Release/obj/gen/src/inspector/protocol /home/dslo/node-ssuresh-intel-large-pages/out/Release/obj/gen/include/inspector; python ../third_party/inspector_protocol/CodeGenerator.py --jinja_dir ../third_party --output_base "/home/dslo/node-ssuresh-intel-large-pages/out/Release/obj/gen/src/inspector" --config ../src/inspector/inspector_protocol_config.json

[01:45|% 100|+ 2274|- 0]: Done
`

gireeshpunathil · 2018-06-08T04:18:45Z

@suresh-srinivas - give me 2 day's time please

gireeshpunathil · 2018-06-08T07:32:33Z

We have a technical problem:

from Linux man pages:
MADV_HUGEPAGE (since Linux 2.6.38)

from our supported platforms:

System	Support type	Version	Architectures	Notes
GNU/Linux	Tier 1	kernel >= 2.6.32, glibc >= 2.12	x64, arm

so we cannot run this on kernel versions between 2.6.32 and 2.6.38

if our CI has the lowest supported level, this wont compile
if 2.6.38 kernel has backward compatibility upto 2.6.32 it may run, but with no effect
if 2.6.38 kernel has no backward compatibility it will break at runtime

suresh-srinivas · 2018-06-08T17:52:57Z

@gireeshpunathil thanks. i have been doing all the work under 4.4.x kernels. What do you suggest?

bnoordhuis · 2018-06-08T19:23:05Z

It's an opt-in build time option so it's alright if it doesn't work everywhere, as long as that's noted somewhere (e.g. in ./configure --help.)

addaleax · 2018-06-12T21:04:58Z

src/node_large_page.cc

+namespace node {
+#define ALIGN(x, a)           (((x) + (a) - 1) & ~((a) - 1))
+#define PAGE_ALIGN_UP(x, a)   ALIGN(x, a)
+#define PAGE_ALIGN_DOWN(x, a) ((x) & ~((a) - 1))


style nit: these could all be inline functions, right?

Thanks. Yes fixed them to be inline functions.

addaleax · 2018-06-12T21:05:26Z

src/node_large_page.cc

+  if (permission.compare("r-xp") == 0) {
+    start = reinterpret_cast<unsigned int64_t>(&__nodetext);
+    char* from = reinterpret_cast<char *>PAGE_ALIGN_UP(start, hps);
+    char* to = reinterpret_cast<char *>PAGE_ALIGN_DOWN(end, hps);


style nit: left-leaning pointers (e.g. char*), and I would not rely on the implicit parentheses added by the macros here

Thanks. Fixed.

addaleax · 2018-06-12T21:06:14Z

src/node_large_page.cc

+  return -1;
+}
+
+bool  IsLargePagesEnabled() {


style nit: there is an extra space after bool

Thanks. Fixed this too.

addaleax · 2018-06-12T21:06:38Z

src/node_large_page.cc

+    return -1;
+  }
+
+  if (r.from > reinterpret_cast<void *> (&MoveTextRegionToLargePages))


ditto, use void* here

Thanks. Yes fixed.

…lignment

gireeshpunathil · 2018-07-31T08:03:38Z

CI: https://ci.nodejs.org/job/node-test-pull-request/16090

gireeshpunathil · 2018-07-31T08:17:11Z

CI failed with:
03:59:39 CONFLICT (content): Merge conflict in src/node.cc

but the above widget says this branch has no conflicts with the base branch

I am bit confused. anyone has any idea?

In either way, @suresh-srinivas - can you please rebase?

[edit: ~~above widget~~ below widget, it went down now]

uttampawar · 2018-07-31T21:38:11Z

@gireeshpunathil Suresh is on vacation but I'll try to rebase and build it. Thanks.

jasnell · 2018-09-10T18:17:24Z

What's the status on this one?

suresh-srinivas · 2018-09-18T23:19:46Z

I just got back from my sabbatical. I will work with Uttam to update per feedback.

uttampawar · 2018-10-02T17:55:03Z

@jasnell Can this PR be closed since the work is almost complete under #22079

suresh-srinivas and others added 18 commits March 23, 2018 12:16

Initial Large Page (2M) support for node.js

0a76c7e

Add support for checking if explicitHugePages and transparentHugePage…

fa0e324

…s are enabled

Added License headers

fdb45cd

Increased number of Pages to be mapped

Get rid of waring messages & code cleanup

b7791c2

Changes to be committed: modified: src/node_large_page.cc

Protect the large pages under #ifdef NODE_ENABLE_LARGE_CODE_PAGES and…

6631eea

… enable node_use_large_pages=true in configure and protect the node_large_page.cc and the link using node_use_large_pages

Added configure option to enable huge pages

843089c

Added else clause to set node_use_large_pages=false by default

077bc01

Merge branch 'configure_fixes' into 2M-Pages-For-Code-16198

7bdd9fc

Finished adding checks at appropriate places to handle possible error…

b91de5a

… condition

Changed return type for two function from void to int

7ef956a

Fixed lint errors.

b02e7a9

Added one more condition check for verify the start address of newly …

2af82b1

…remapped region

Fixed syntax error due to wring data type. int64 to int64_t

cae9285

Removed explictHugePages code

30114b6

Merge branch 'add-checks' into 2M-Pages-For-Code-16198

39e1f0d

Merge branch '2M-Pages-For-Code-16198' of https://github.intel.com/DS…

49cd0de

…LO/node into intel-large-pages

Added Large Page Support

2dd9e8c

src: node.cc,node_large_page.cc,node_large_page.h build: node.gyp,node.gypi,ld.script config: configure

Merge branch 'intel-large-pages' of https://github.com/suresh-sriniva…

51d0f02

…s/node into intel-large-pages

nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. lib / src Issues and PRs related to general changes in the lib or src directory. labels May 31, 2018

mscdex added the performance Issues and PRs related to the performance of Node.js. label May 31, 2018

gireeshpunathil reviewed Jun 1, 2018

View reviewed changes

gireeshpunathil requested review from bnoordhuis, danbev, addaleax and cjihrig June 1, 2018 17:27

nodejs deleted a comment from refack Jun 1, 2018

Update PR based on feedback

2f672ee

bnoordhuis reviewed Jun 2, 2018

View reviewed changes

Addressing the additional PR feedback

31504cc

suresh-srinivas added 4 commits June 3, 2018 09:28

Fix the gypi style issue

f998c58

Update with stylistic changes (eg char* instead of char *, IsLargePag…

9f15cfc

…eEnabled instead of isLargePageEnabled)

Add additional guard so large pages is only under Linux and target_ar…

d6de361

…ch=x64

Style fixes according to the Node C++ Style Guide

29c7d13

i) CamelCase for methods, functions ii) snake_case for variables/structs iii) indentation (dont indent code inside namespace)

gabrielschulhof reviewed Jun 7, 2018

View reviewed changes

suresh-srinivas added 2 commits June 7, 2018 11:27

Add #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

600cf54

Add detailed help message to configure --with-largepages

f0a6dcb

addaleax approved these changes Jun 12, 2018

View reviewed changes

Fix style issues and created inline functions instead of macros for a…

4610793

…lignment

gireeshpunathil approved these changes Jul 31, 2018

View reviewed changes

uttampawar mentioned this pull request Aug 2, 2018

Linux large pages - after rebase #22079

Merged

2 tasks

jasnell added the stalled Issues and PRs that are stalled. label Sep 10, 2018

lundibundi closed this Oct 2, 2018

		@@ -4420,6 +4431,7 @@ int Start(int argc, char** argv) {
		// will never be fully cleaned up.
		v8_platform.Dispose();


		nregion.found_text_region = false;

		ifs.open("/proc/self/maps");

		}
		#endif

Large Page Support for Code Issue: 16198 #21064

Large Page Support for Code Issue: 16198 #21064

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gireeshpunathil commented Jun 8, 2018 •

edited

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gireeshpunathil commented Jul 31, 2018 •

edited

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uttampawar commented Oct 2, 2018 •

edited

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