| From: |
| Gargi Sharma <gs051095-AT-gmail.com> |
| To: |
| linux-kernel-AT-vger.kernel.org |
| Subject: |
| [RFC 0/2] Replace PID implementation with IDR API |
| Date: |
| Sat, 9 Sep 2017 18:03:15 +0530 |
| Message-ID: |
| <cover.1504952909.git.gs051095@gmail.com> |
| Cc: |
| riel-AT-surriel.com, julia.lawall-AT-lip6.fr, akpm-AT-linux-foundation.org, mingo-AT-kernel.org, pasha.tatashin-AT-oracle.com, ktkhai-AT-virtuozzo.com, oleg-AT-redhat.com, wangkefeng.wang-AT-huawei.org, Gargi Sharma <gs051095-AT-gmail.com> |
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
