diff options
Diffstat (limited to 'tools/squashfs4/patches/003-Only-use-available-CPUs.patch')
| -rw-r--r-- | tools/squashfs4/patches/003-Only-use-available-CPUs.patch | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/tools/squashfs4/patches/003-Only-use-available-CPUs.patch b/tools/squashfs4/patches/003-Only-use-available-CPUs.patch new file mode 100644 index 0000000000..4f608b9ed6 --- /dev/null +++ b/tools/squashfs4/patches/003-Only-use-available-CPUs.patch @@ -0,0 +1,92 @@ +From bc8e655a420d2f62bb0597947e96dce7b4d3fb36 Mon Sep 17 00:00:00 2001 +From: Wessel Dankers <wsl@fruit.je> +Date: Sun, 30 Oct 2022 19:29:28 +0100 +Subject: [PATCH] Only use available CPUs + +Not all online CPUs may be available for the current process, +especially when CPU affinity is involved. In such cases too many +threads will be created, which will then compete unnecessarily +for CPU time. + +Use sched_getaffinity() to determine the correct number of threads +to create. +--- + squashfs-tools/mksquashfs.c | 16 ++++++++++++---- + squashfs-tools/unsquashfs.c | 13 ++++++++++--- + 2 files changed, 22 insertions(+), 7 deletions(-) + +--- a/squashfs-tools/mksquashfs.c ++++ b/squashfs-tools/mksquashfs.c +@@ -52,7 +52,9 @@ + #include <ctype.h> + #include <sys/sysinfo.h> + +-#ifndef linux ++#ifdef linux ++#include <sched.h> ++#else + #include <sys/sysctl.h> + #endif + +@@ -5079,7 +5081,15 @@ static void initialise_threads(int readq + BAD_ERROR("Failed to set signal mask in intialise_threads\n"); + + if(processors == -1) { +-#ifndef linux ++#ifdef linux ++ cpu_set_t cpu_set; ++ CPU_ZERO(&cpu_set); ++ ++ if(sched_getaffinity(0, sizeof cpu_set, &cpu_set) == -1) ++ processors = sysconf(_SC_NPROCESSORS_ONLN); ++ else ++ processors = CPU_COUNT(&cpu_set); ++#else + int mib[2]; + size_t len = sizeof(processors); + +@@ -5096,8 +5106,6 @@ static void initialise_threads(int readq + ERROR_EXIT(" Defaulting to 1\n"); + processors = 1; + } +-#else +- processors = sysconf(_SC_NPROCESSORS_ONLN); + #endif + } + +--- a/squashfs-tools/unsquashfs.c ++++ b/squashfs-tools/unsquashfs.c +@@ -33,6 +33,7 @@ + #include "fnmatch_compat.h" + + #ifdef __linux__ ++#include <sched.h> + #include <sys/sysinfo.h> + #include <sys/sysmacros.h> + #elif defined __FreeBSD__ +@@ -2719,7 +2720,15 @@ void initialise_threads(int fragment_buf + } + + if(processors == -1) { +-#ifndef linux ++#ifdef linux ++ cpu_set_t cpu_set; ++ CPU_ZERO(&cpu_set); ++ ++ if(sched_getaffinity(0, sizeof cpu_set, &cpu_set) == -1) ++ processors = sysconf(_SC_NPROCESSORS_ONLN); ++ else ++ processors = CPU_COUNT(&cpu_set); ++#else + int mib[2]; + size_t len = sizeof(processors); + +@@ -2735,8 +2744,6 @@ void initialise_threads(int fragment_buf + "Defaulting to 1\n"); + processors = 1; + } +-#else +- processors = sysconf(_SC_NPROCESSORS_ONLN); + #endif + } + |