Hugh Dickins 42aee6c495 cgroup: revert ss_id_lock to spinlock ... Commit c1e2ee2dc4 ("memcg: replace ss->id_lock with a rwlock") has now been seen to cause the unfair behavior we should have expected from converting a spinlock to an rwlock: softlockup in cgroup_mkdir(), whose get_new_cssid() is waiting for the wlock, while there are 19 tasks using the rlock in css_get_next() to get on with their memcg workload (in an artificial test, admittedly). Yet lib/idr.c was made suitable for RCU way back: revert that commit, restoring ss->id_lock to a spinlock. Signed-off-by: Hugh Dickins <hughd@google.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-03-21 17:55:01 -07:00
..
acpi	Merge 3.3-rc2 into the driver-core-next branch.	2012-02-02 11:24:44 -08:00
asm-generic	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
crypto	crypto: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:16 +08:00
drm	drm/exynos: exynos_drm.h header file fixes	2012-02-15 10:29:12 +09:00
keys	keys: add a "logon" key type	2012-01-17 22:39:40 -06:00
linux	cgroup: revert ss_id_lock to spinlock	2012-03-21 17:55:01 -07:00
math-emu
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-01-18 12:53:54 -08:00
misc
mtd
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-03-20 21:04:47 -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	SCSI & usb-storage: add flags for VPD pages and REPORT LUNS	2012-02-08 17:36:41 -08:00
sound	Merge branch 'fix/asoc' into for-linus	2012-01-31 15:13:14 +01:00
target	target: Change target_submit_cmd() to return void	2012-02-07 06:41:04 +00:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-03-20 21:12:50 -07:00
video	fbdev fixes for 3.3	2012-02-07 15:54:02 -08:00
xen	Merge branch 'for-3.3/drivers' of git://git.kernel.dk/linux-block	2012-01-15 12:48:41 -08:00
Kbuild