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authorLénaïc Huard <lenaic.huard@datadoghq.com>2025-02-01 14:19:04 +0100
committerGopher Robot <gobot@golang.org>2025-03-04 11:22:33 -0800
commit52eaed66335e90ceb6ad65873889ccca46851ee9 (patch)
treeb97239326ac57e28791266884c98cfa4f7e5bf68 /src/internal/runtime
parentf95941de4908a45287d700697347aa69d714457b (diff)
downloadgo-52eaed66335e90ceb6ad65873889ccca46851ee9.tar.xz
runtime: decorate anonymous memory mappings
Leverage the prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, ...) API to name the anonymous memory areas. This API has been introduced in Linux 5.17 to decorate the anonymous memory areas shown in /proc/<pid>/maps. This is already used by glibc. See: * https://sourceware.org/git/?p=glibc.git;a=blob;f=malloc/malloc.c;h=27dfd1eb907f4615b70c70237c42c552bb4f26a8;hb=HEAD#l2434 * https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/setvmaname.c;h=ea93a5ffbebc9e5a7e32a297138f465724b4725f;hb=HEAD#l63 This can be useful when investigating the memory consumption of a multi-language program. On a 100% Go program, pprof profiler can be used to profile the memory consumption of the program. But pprof is only aware of what happens within the Go world. On a multi-language program, there could be a doubt about whether the suspicious extra-memory consumption comes from the Go part or the native part. With this change, the following Go program: package main import ( "fmt" "log" "os" ) /* #include <stdlib.h> void f(void) { (void)malloc(1024*1024*1024); } */ import "C" func main() { C.f() data, err := os.ReadFile("/proc/self/maps") if err != nil { log.Fatal(err) } fmt.Println(string(data)) } produces this output: $ GLIBC_TUNABLES=glibc.mem.decorate_maps=1 ~/doc/devel/open-source/go/bin/go run . 00400000-00402000 r--p 00000000 00:21 28451768 /home/lenaic/.cache/go-build/9f/9f25a17baed5a80d03eb080a2ce2a5ff49c17f9a56e28330f0474a2bb74a30a0-d/test_vma_name 00402000-004a4000 r-xp 00002000 00:21 28451768 /home/lenaic/.cache/go-build/9f/9f25a17baed5a80d03eb080a2ce2a5ff49c17f9a56e28330f0474a2bb74a30a0-d/test_vma_name 004a4000-00574000 r--p 000a4000 00:21 28451768 /home/lenaic/.cache/go-build/9f/9f25a17baed5a80d03eb080a2ce2a5ff49c17f9a56e28330f0474a2bb74a30a0-d/test_vma_name 00574000-00575000 r--p 00173000 00:21 28451768 /home/lenaic/.cache/go-build/9f/9f25a17baed5a80d03eb080a2ce2a5ff49c17f9a56e28330f0474a2bb74a30a0-d/test_vma_name 00575000-00580000 rw-p 00174000 00:21 28451768 /home/lenaic/.cache/go-build/9f/9f25a17baed5a80d03eb080a2ce2a5ff49c17f9a56e28330f0474a2bb74a30a0-d/test_vma_name 00580000-005a4000 rw-p 00000000 00:00 0 2e075000-2e096000 rw-p 00000000 00:00 0 [heap] c000000000-c000400000 rw-p 00000000 00:00 0 [anon: Go: heap] c000400000-c004000000 ---p 00000000 00:00 0 [anon: Go: heap reservation] 777f40000000-777f40021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 777f40021000-777f44000000 ---p 00000000 00:00 0 777f44000000-777f44021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 777f44021000-777f48000000 ---p 00000000 00:00 0 777f48000000-777f48021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 777f48021000-777f4c000000 ---p 00000000 00:00 0 777f4c000000-777f4c021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 777f4c021000-777f50000000 ---p 00000000 00:00 0 777f50000000-777f50021000 rw-p 00000000 00:00 0 [anon: glibc: malloc arena] 777f50021000-777f54000000 ---p 00000000 00:00 0 777f55afb000-777f55afc000 ---p 00000000 00:00 0 777f55afc000-777f562fc000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 216378] 777f562fc000-777f562fd000 ---p 00000000 00:00 0 777f562fd000-777f56afd000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 216377] 777f56afd000-777f56afe000 ---p 00000000 00:00 0 777f56afe000-777f572fe000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 216376] 777f572fe000-777f572ff000 ---p 00000000 00:00 0 777f572ff000-777f57aff000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 216375] 777f57aff000-777f57b00000 ---p 00000000 00:00 0 777f57b00000-777f58300000 rw-p 00000000 00:00 0 [anon: glibc: pthread stack: 216374] 777f58300000-777f58400000 rw-p 00000000 00:00 0 [anon: Go: page alloc index] 777f58400000-777f5a400000 rw-p 00000000 00:00 0 [anon: Go: heap index] 777f5a400000-777f6a580000 ---p 00000000 00:00 0 [anon: Go: scavenge index] 777f6a580000-777f6a581000 rw-p 00000000 00:00 0 [anon: Go: scavenge index] 777f6a581000-777f7a400000 ---p 00000000 00:00 0 [anon: Go: scavenge index] 777f7a400000-777f8a580000 ---p 00000000 00:00 0 [anon: Go: page summary] 777f8a580000-777f8a581000 rw-p 00000000 00:00 0 [anon: Go: page alloc] 777f8a581000-777f9c430000 ---p 00000000 00:00 0 [anon: Go: page summary] 777f9c430000-777f9c431000 rw-p 00000000 00:00 0 [anon: Go: page alloc] 777f9c431000-777f9e806000 ---p 00000000 00:00 0 [anon: Go: page summary] 777f9e806000-777f9e807000 rw-p 00000000 00:00 0 [anon: Go: page alloc] 777f9e807000-777f9ec00000 ---p 00000000 00:00 0 [anon: Go: page summary] 777f9ec36000-777f9ecb6000 rw-p 00000000 00:00 0 [anon: Go: immortal metadata] 777f9ecb6000-777f9ecc6000 rw-p 00000000 00:00 0 [anon: Go: gc bits] 777f9ecc6000-777f9ecd6000 rw-p 00000000 00:00 0 [anon: Go: allspans array] 777f9ecd6000-777f9ece7000 rw-p 00000000 00:00 0 [anon: Go: immortal metadata] 777f9ece7000-777f9ed67000 ---p 00000000 00:00 0 [anon: Go: page summary] 777f9ed67000-777f9ed68000 rw-p 00000000 00:00 0 [anon: Go: page alloc] 777f9ed68000-777f9ede7000 ---p 00000000 00:00 0 [anon: Go: page summary] 777f9ede7000-777f9ee07000 rw-p 00000000 00:00 0 [anon: Go: page alloc] 777f9ee07000-777f9ee0a000 rw-p 00000000 00:00 0 [anon: glibc: loader malloc] 777f9ee0a000-777f9ee2e000 r--p 00000000 00:21 48158213 /usr/lib/libc.so.6 777f9ee2e000-777f9ef9f000 r-xp 00024000 00:21 48158213 /usr/lib/libc.so.6 777f9ef9f000-777f9efee000 r--p 00195000 00:21 48158213 /usr/lib/libc.so.6 777f9efee000-777f9eff2000 r--p 001e3000 00:21 48158213 /usr/lib/libc.so.6 777f9eff2000-777f9eff4000 rw-p 001e7000 00:21 48158213 /usr/lib/libc.so.6 777f9eff4000-777f9effc000 rw-p 00000000 00:00 0 777f9effc000-777f9effe000 rw-p 00000000 00:00 0 [anon: glibc: loader malloc] 777f9f00a000-777f9f04a000 rw-p 00000000 00:00 0 [anon: Go: immortal metadata] 777f9f04a000-777f9f04c000 r--p 00000000 00:00 0 [vvar] 777f9f04c000-777f9f04e000 r--p 00000000 00:00 0 [vvar_vclock] 777f9f04e000-777f9f050000 r-xp 00000000 00:00 0 [vdso] 777f9f050000-777f9f051000 r--p 00000000 00:21 48158204 /usr/lib/ld-linux-x86-64.so.2 777f9f051000-777f9f07a000 r-xp 00001000 00:21 48158204 /usr/lib/ld-linux-x86-64.so.2 777f9f07a000-777f9f085000 r--p 0002a000 00:21 48158204 /usr/lib/ld-linux-x86-64.so.2 777f9f085000-777f9f087000 r--p 00034000 00:21 48158204 /usr/lib/ld-linux-x86-64.so.2 777f9f087000-777f9f088000 rw-p 00036000 00:21 48158204 /usr/lib/ld-linux-x86-64.so.2 777f9f088000-777f9f089000 rw-p 00000000 00:00 0 7ffc7bfa7000-7ffc7bfc8000 rw-p 00000000 00:00 0 [stack] ffffffffff600000-ffffffffff601000 --xp 00000000 00:00 0 [vsyscall] The anonymous memory areas are now labelled so that we can see which ones have been allocated by the Go runtime versus which ones have been allocated by the glibc. Fixes #71546 Change-Id: I304e8b4dd7f2477a6da794fd44e9a7a5354e4bf4 Reviewed-on: https://go-review.googlesource.com/c/go/+/646095 Auto-Submit: Alan Donovan <adonovan@google.com> Commit-Queue: Alan Donovan <adonovan@google.com> Reviewed-by: Felix Geisendörfer <felix.geisendoerfer@datadoghq.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Diffstat (limited to 'src/internal/runtime')
-rw-r--r--src/internal/runtime/syscall/defs_linux.go3
-rw-r--r--src/internal/runtime/syscall/defs_linux_386.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_amd64.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_arm.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_arm64.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_loong64.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_mips64x.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_mipsx.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_ppc64x.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_riscv64.go1
-rw-r--r--src/internal/runtime/syscall/defs_linux_s390x.go1
11 files changed, 13 insertions, 0 deletions
diff --git a/src/internal/runtime/syscall/defs_linux.go b/src/internal/runtime/syscall/defs_linux.go
index b2e36a244f..70a1388a9e 100644
--- a/src/internal/runtime/syscall/defs_linux.go
+++ b/src/internal/runtime/syscall/defs_linux.go
@@ -16,4 +16,7 @@ const (
EPOLL_CTL_DEL = 0x2
EPOLL_CTL_MOD = 0x3
EFD_CLOEXEC = 0x80000
+
+ PR_SET_VMA = 0x53564d41
+ PR_SET_VMA_ANON_NAME = 0
)
diff --git a/src/internal/runtime/syscall/defs_linux_386.go b/src/internal/runtime/syscall/defs_linux_386.go
index 68e687fb14..2cfedab7c6 100644
--- a/src/internal/runtime/syscall/defs_linux_386.go
+++ b/src/internal/runtime/syscall/defs_linux_386.go
@@ -7,6 +7,7 @@ package syscall
const (
SYS_FCNTL = 55
SYS_MPROTECT = 125
+ SYS_PRCTL = 172
SYS_EPOLL_CTL = 255
SYS_EPOLL_PWAIT = 319
SYS_EPOLL_CREATE1 = 329
diff --git a/src/internal/runtime/syscall/defs_linux_amd64.go b/src/internal/runtime/syscall/defs_linux_amd64.go
index ec480f5817..f664a59ad7 100644
--- a/src/internal/runtime/syscall/defs_linux_amd64.go
+++ b/src/internal/runtime/syscall/defs_linux_amd64.go
@@ -7,6 +7,7 @@ package syscall
const (
SYS_MPROTECT = 10
SYS_FCNTL = 72
+ SYS_PRCTL = 157
SYS_EPOLL_CTL = 233
SYS_EPOLL_PWAIT = 281
SYS_EPOLL_CREATE1 = 291
diff --git a/src/internal/runtime/syscall/defs_linux_arm.go b/src/internal/runtime/syscall/defs_linux_arm.go
index c5d1503012..2850199a65 100644
--- a/src/internal/runtime/syscall/defs_linux_arm.go
+++ b/src/internal/runtime/syscall/defs_linux_arm.go
@@ -7,6 +7,7 @@ package syscall
const (
SYS_FCNTL = 55
SYS_MPROTECT = 125
+ SYS_PRCTL = 172
SYS_EPOLL_CTL = 251
SYS_EPOLL_PWAIT = 346
SYS_EPOLL_CREATE1 = 357
diff --git a/src/internal/runtime/syscall/defs_linux_arm64.go b/src/internal/runtime/syscall/defs_linux_arm64.go
index f743fe31a5..1c951c1e7d 100644
--- a/src/internal/runtime/syscall/defs_linux_arm64.go
+++ b/src/internal/runtime/syscall/defs_linux_arm64.go
@@ -9,6 +9,7 @@ const (
SYS_EPOLL_CTL = 21
SYS_EPOLL_PWAIT = 22
SYS_FCNTL = 25
+ SYS_PRCTL = 167
SYS_MPROTECT = 226
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 19
diff --git a/src/internal/runtime/syscall/defs_linux_loong64.go b/src/internal/runtime/syscall/defs_linux_loong64.go
index 82218d1509..dfeee05737 100644
--- a/src/internal/runtime/syscall/defs_linux_loong64.go
+++ b/src/internal/runtime/syscall/defs_linux_loong64.go
@@ -9,6 +9,7 @@ const (
SYS_EPOLL_CTL = 21
SYS_EPOLL_PWAIT = 22
SYS_FCNTL = 25
+ SYS_PRCTL = 167
SYS_MPROTECT = 226
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 19
diff --git a/src/internal/runtime/syscall/defs_linux_mips64x.go b/src/internal/runtime/syscall/defs_linux_mips64x.go
index 4e0fd1f5d1..b9b8818d30 100644
--- a/src/internal/runtime/syscall/defs_linux_mips64x.go
+++ b/src/internal/runtime/syscall/defs_linux_mips64x.go
@@ -9,6 +9,7 @@ package syscall
const (
SYS_MPROTECT = 5010
SYS_FCNTL = 5070
+ SYS_PRCTL = 5153
SYS_EPOLL_CTL = 5208
SYS_EPOLL_PWAIT = 5272
SYS_EPOLL_CREATE1 = 5285
diff --git a/src/internal/runtime/syscall/defs_linux_mipsx.go b/src/internal/runtime/syscall/defs_linux_mipsx.go
index b87a355093..f147865f44 100644
--- a/src/internal/runtime/syscall/defs_linux_mipsx.go
+++ b/src/internal/runtime/syscall/defs_linux_mipsx.go
@@ -9,6 +9,7 @@ package syscall
const (
SYS_FCNTL = 4055
SYS_MPROTECT = 4125
+ SYS_PRCTL = 4192
SYS_EPOLL_CTL = 4249
SYS_EPOLL_PWAIT = 4313
SYS_EPOLL_CREATE1 = 4326
diff --git a/src/internal/runtime/syscall/defs_linux_ppc64x.go b/src/internal/runtime/syscall/defs_linux_ppc64x.go
index 8235edd795..81421089db 100644
--- a/src/internal/runtime/syscall/defs_linux_ppc64x.go
+++ b/src/internal/runtime/syscall/defs_linux_ppc64x.go
@@ -9,6 +9,7 @@ package syscall
const (
SYS_FCNTL = 55
SYS_MPROTECT = 125
+ SYS_PRCTL = 171
SYS_EPOLL_CTL = 237
SYS_EPOLL_PWAIT = 303
SYS_EPOLL_CREATE1 = 315
diff --git a/src/internal/runtime/syscall/defs_linux_riscv64.go b/src/internal/runtime/syscall/defs_linux_riscv64.go
index 82218d1509..dfeee05737 100644
--- a/src/internal/runtime/syscall/defs_linux_riscv64.go
+++ b/src/internal/runtime/syscall/defs_linux_riscv64.go
@@ -9,6 +9,7 @@ const (
SYS_EPOLL_CTL = 21
SYS_EPOLL_PWAIT = 22
SYS_FCNTL = 25
+ SYS_PRCTL = 167
SYS_MPROTECT = 226
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 19
diff --git a/src/internal/runtime/syscall/defs_linux_s390x.go b/src/internal/runtime/syscall/defs_linux_s390x.go
index 08073c01f0..1d9d5b2219 100644
--- a/src/internal/runtime/syscall/defs_linux_s390x.go
+++ b/src/internal/runtime/syscall/defs_linux_s390x.go
@@ -7,6 +7,7 @@ package syscall
const (
SYS_FCNTL = 55
SYS_MPROTECT = 125
+ SYS_PRCTL = 172
SYS_EPOLL_CTL = 250
SYS_EPOLL_PWAIT = 312
SYS_EPOLL_CREATE1 = 327
generated by cgit v1.3-5-g9baa (git 2.53.0) at 2026-04-17 10:29:17 +0000