KAMEZAWA Hiroyuki bda7bad62b procfs: speed up /proc/pid/stat, statm ... Process accounting applications as top, ps visit some files under /proc/<pid>. With seq_put_decimal_ull(), we can optimize /proc/<pid>/stat and /proc/<pid>/statm files. This patch adds - seq_put_decimal_ll() for signed values. - allow delimiter == 0. - convert seq_printf() to seq_put_decimal_ull/ll in /proc/stat, statm. Test result on a system with 2000+ procs. Before patch: [kamezawa@bluextal test]$ top -b -n 1 | wc -l 2223 [kamezawa@bluextal test]$ time top -b -n 1 > /dev/null real 0m0.675s user 0m0.044s sys 0m0.121s [kamezawa@bluextal test]$ time ps -elf > /dev/null real 0m0.236s user 0m0.056s sys 0m0.176s After patch: kamezawa@bluextal ~]$ time top -b -n 1 > /dev/null real 0m0.657s user 0m0.052s sys 0m0.100s [kamezawa@bluextal ~]$ time ps -elf > /dev/null real 0m0.198s user 0m0.050s sys 0m0.145s Considering top, ps tend to scan /proc periodically, this will reduce cpu consumption by top/ps to some extent. [akpm@linux-foundation.org: checkpatch fixes] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-03-23 16:58:42 -07:00
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acpi
asm-generic	coredump: add VM_NODUMP, MADV_NODUMP, MADV_CLEAR_NODUMP	2012-03-23 16:58:42 -07:00
crypto	crypto: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:16 +08:00
drm	headers: include linux/types.h where appropriate	2012-03-23 16:58:31 -07:00
keys
linux	procfs: speed up /proc/pid/stat, statm	2012-03-23 16:58:42 -07:00
math-emu
media
misc
mtd
net	poll: add poll_requested_events() and poll_does_not_wait() functions	2012-03-23 16:58:38 -07:00
pcmcia
rdma	Merge branches 'cma', 'cxgb3', 'cxgb4', 'ehca', 'iser', 'mad', 'nes', 'qib', 'srp' and 'srpt' into for-next	2012-03-19 09:50:33 -07:00
rxrpc
scsi	headers: include linux/types.h where appropriate	2012-03-23 16:58:31 -07:00
sound	headers: include linux/types.h where appropriate	2012-03-23 16:58:31 -07:00
target	target: Use array_zalloc for device_list	2012-03-15 19:15:51 -07:00
trace	NFS client updates for Linux 3.4	2012-03-23 08:53:47 -07:00
video	fbdev: sh_mipi_dsi: add extra phyctrl for sh_mipi_dsi_info	2012-03-21 07:24:01 +00:00
xen	include/ and checkpatch: prefer __scanf to __attribute__((format(scanf,...)	2012-03-23 16:58:36 -07:00
Kbuild