This patch series replaces kernel bitmap implementation of PID allocation with IDR API.
The following are the stats for pid and pid_namespace object files before and after the replacement. There is a noteworthy change between the IDR and bitmap implementation. Before text data bss dec hex filename 8447 3894 64 12405 3075 kernel/pid.o After text data bss dec hex filename 3602 324 8 3934 f5e kernel/pid.o Before text data bss dec hex filename 5692 1842 192 7726 1e2e kernel/pid_namespace.o After text data bss dec hex filename 2858 216 16 3090 c12 kernel/pid_namespace.o There wasn't a considerable difference between the time required for allocation of PIDs to the processes. The IDR implementation is a little faster than bitmap implementation. The next change in the pipeline is replacing pidhash with IDR API implementation. Gargi Sharma (2): proc: Return if nothing to unmount pid: Replace PID bitmap implementation with IDR API fs/proc/base.c | 4 + include/linux/pid.h | 1 + include/linux/pid_namespace.h | 5 +- init/main.c | 4 +- kernel/pid.c | 204 ++++++++---------------------------------- kernel/pid_namespace.c | 39 ++++---- 6 files changed, 63 insertions(+), 194 deletions(-) -- 2.7.4
