Re: [PATCH 4/5] perf top: switch to overwrite mode

2017-12-05 Thread Wangnan (F)
On 2017/12/6 6:39, kan.li...@intel.com wrote: From: Kan Liang perf_top__mmap_read has severe performance issue in Knights Landing/Mill, when monitoring in heavy load system. It costs several minutes to finish, which is unacceptable. Currently, perf top is non overwrite

Re: [PATCH 4/5] perf top: switch to overwrite mode

2017-12-05 Thread Wangnan (F)
On 2017/12/6 6:39, kan.li...@intel.com wrote: From: Kan Liang perf_top__mmap_read has severe performance issue in Knights Landing/Mill, when monitoring in heavy load system. It costs several minutes to finish, which is unacceptable. Currently, perf top is non overwrite mode. For non

[PATCH 4/5] perf top: switch to overwrite mode

2017-12-05 Thread kan . liang
From: Kan Liang perf_top__mmap_read has severe performance issue in Knights Landing/Mill, when monitoring in heavy load system. It costs several minutes to finish, which is unacceptable. Currently, perf top is non overwrite mode. For non overwrite mode, it tries to read

[PATCH 4/5] perf top: switch to overwrite mode

2017-12-05 Thread kan . liang
From: Kan Liang perf_top__mmap_read has severe performance issue in Knights Landing/Mill, when monitoring in heavy load system. It costs several minutes to finish, which is unacceptable. Currently, perf top is non overwrite mode. For non overwrite mode, it tries to read everything in the