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linux/fs/proc
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David Rientjes 1403830294 fs, proc: unconditional cond_resched when reading smaps 
If there are large numbers of hugepages to iterate while reading
/proc/pid/smaps, the page walk never does cond_resched().  On archs
without split pmd locks, there can be significant and observable
contention on mm->page_table_lock which cause lengthy delays without
rescheduling.

Always reschedule in smaps_pte_range() if necessary since the pagewalk
iteration can be expensive.

Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1708211405520.131071@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-09-08 18:26:47 -07:00
..
array.c sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h> 2017-03-02 08:42:39 +01:00
base.c mm: add /proc/pid/smaps_rollup 2017-09-06 17:27:30 -07:00
cmdline.c fs/proc: don't use module_init for non-modular core code 2014-01-23 16:37:02 -08:00
consoles.c fs/proc: don't use module_init for non-modular core code 2014-01-23 16:37:02 -08:00
cpuinfo.c fs/proc: don't use module_init for non-modular core code 2014-01-23 16:37:02 -08:00
devices.c block: order /proc/devices by major number 2017-07-17 15:42:20 +02:00
fd.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h> 2017-03-02 08:42:29 +01:00
fd.h proc: unsigned file descriptors 2016-09-27 18:47:38 -04:00
generic.c proc: uninline proc_create() 2017-09-08 18:26:47 -07:00
inode.c fs/proc/inode.c: remove cast from memory allocation 2017-05-08 17:15:10 -07:00
internal.h mm: add /proc/pid/smaps_rollup 2017-09-06 17:27:30 -07:00
interrupts.c fs/proc: don't use module_init for non-modular core code 2014-01-23 16:37:02 -08:00
Kconfig fs, proc: add help for CONFIG_PROC_CHILDREN 2015-07-17 16:39:52 -07:00
kcore.c fs/proc: kcore: use kcore_list type to check for vmalloc/module address 2017-06-20 12:42:57 +01:00
kmsg.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
loadavg.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/stat.h> 2017-03-02 08:42:34 +01:00
Makefile fs/proc: Add compiler check for -Wno-override-init to support gcc < 4.2 2016-08-03 12:45:23 -04:00
meminfo.c mm: rename global_page_state to global_zone_page_state 2017-09-06 17:27:29 -07:00
namespaces.c pidns: expose task pid_ns_for_children to userspace 2017-05-08 17:15:12 -07:00
nommu.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
page.c mm: fix KPF_SWAPCACHE in /proc/kpageflags 2017-02-07 12:08:32 -08:00
proc_net.c Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 11:38:56 -08:00
proc_sysctl.c Merge branch 'akpm' (patches from Andrew) 2017-07-13 12:38:49 -07:00
proc_tty.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
root.c Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-03-03 11:38:56 -08:00
self.c vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
softirqs.c fs/proc: don't use module_init for non-modular core code 2014-01-23 16:37:02 -08:00
stat.c sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h> 2017-03-02 08:42:39 +01:00
task_mmu.c fs, proc: unconditional cond_resched when reading smaps 2017-09-08 18:26:47 -07:00
task_nommu.c fs, proc: remove priv argument from is_stack 2017-09-08 18:26:47 -07:00
thread_self.c vfs: remove ".readlink = generic_readlink" assignments 2016-12-09 16:45:04 +01:00
uptime.c sched/cputime: Convert kcpustat to nsecs 2017-02-01 09:13:47 +01:00
version.c fs/proc: don't use module_init for non-modular core code 2014-01-23 16:37:02 -08:00
vmcore.c userfaultfd: non-cooperative: add event for memory unmaps 2017-02-24 17:46:55 -08:00