diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2016-03-18 17:20:30 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-03-19 10:26:40 +0100 |
| commit | 3e8db2246b434c6b18a6a9f09904038bddcf76c7 (patch) | |
| tree | 1366cdf25c51ef7c276872152a5077a982ccbf72 /arch/x86 | |
| parent | x86/topology: Fix Intel HT disable (diff) | |
| download | linux-3e8db2246b434c6b18a6a9f09904038bddcf76c7.tar.xz linux-3e8db2246b434c6b18a6a9f09904038bddcf76c7.zip | |
x86/topology: Use total_cpus not nr_cpu_ids for logical packages
nr_cpu_ids can be limited on the command line via nr_cpus=. That can break the
logical package management because it results in a smaller number of packages,
but the cpus to online are occupying the full package space as the hyper
threads are enumerated after the physical cores typically.
total_cpus is the real possible cpu space not limited by nr_cpus command line
and gives us the proper number of packages.
Reported-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Fixes: 1f12e32f4cd5 ("x86/topology: Create logical package id")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Xiong Zhou <jencce.kernel@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Andreas Herrmann <aherrmann@suse.com>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1603181254330.3978@nanos
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 81e6a432f23c..b2c99f811c3f 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -325,9 +325,14 @@ static void __init smp_init_package_map(void) * By not including this we'll sometimes over-estimate the number of * logical packages by the amount of !present siblings, but this is * still better than MAX_LOCAL_APIC. + * + * We use total_cpus not nr_cpu_ids because nr_cpu_ids can be limited + * on the command line leading to a similar issue as the HT disable + * problem because the hyperthreads are usually enumerated after the + * primary cores. */ ncpus = boot_cpu_data.x86_max_cores; - __max_logical_packages = DIV_ROUND_UP(nr_cpu_ids, ncpus); + __max_logical_packages = DIV_ROUND_UP(total_cpus, ncpus); /* * Possibly larger than what we need as the number of apic ids per |