Re: [RESEND PATCH v3] tracing: Allocate mask_str buffer dynamically

2017-11-29 Thread Du, Changbin
On Wed, Nov 29, 2017 at 10:12:09PM -0500, Steven Rostedt wrote: > On Wed, 29 Nov 2017 12:42:45 +0800 > changbin...@intel.com wrote: > > > From: Changbin Du > > > > The default NR_CPUS can be very large, but actual possible nr_cpu_ids > > usually is very small. For my x86 distribution, the NR_CPU

Re: [RESEND PATCH v3] tracing: Allocate mask_str buffer dynamically

2017-11-29 Thread Steven Rostedt
On Wed, 29 Nov 2017 12:42:45 +0800 changbin...@intel.com wrote: > From: Changbin Du > > The default NR_CPUS can be very large, but actual possible nr_cpu_ids > usually is very small. For my x86 distribution, the NR_CPUS is 8192 and > nr_cpu_ids is 4. About 2 pages are wasted. > > Most machines