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authorAlexey Dobriyan <adobriyan@gmail.com>2009-03-31 18:23:18 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-01 11:59:13 -0400
commit704503d836042d4a4c7685b7036e7de0418fbc0f (patch)
tree218bea088f0b286981221e44d5247dab98020d30 /kernel/sysctl.c
parent6a11f75b6a17b5d9ac5025f8d048382fd1f47377 (diff)
mm: fix proc_dointvec_userhz_jiffies "breakage"
Addresses http://bugzilla.kernel.org/show_bug.cgi?id=9838 On i386, HZ=1000, jiffies_to_clock_t() converts time in a somewhat strange way from the user's point of view: # echo 500 >/proc/sys/vm/dirty_writeback_centisecs # cat /proc/sys/vm/dirty_writeback_centisecs 499 So, we have 5000 jiffies converted to only 499 clock ticks and reported back. TICK_NSEC = 999848 ACTHZ = 256039 Keeping in-kernel variable in units passed from userspace will fix issue of course, but this probably won't be right for every sysctl. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c5ef44ff850f..2e490a389dd2 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1010,7 +1010,7 @@ static struct ctl_table vm_table[] = {
1010 .data = &dirty_expire_interval, 1010 .data = &dirty_expire_interval,
1011 .maxlen = sizeof(dirty_expire_interval), 1011 .maxlen = sizeof(dirty_expire_interval),
1012 .mode = 0644, 1012 .mode = 0644,
1013 .proc_handler = &proc_dointvec_userhz_jiffies, 1013 .proc_handler = &proc_dointvec,
1014 }, 1014 },
1015 { 1015 {
1016 .ctl_name = VM_NR_PDFLUSH_THREADS, 1016 .ctl_name = VM_NR_PDFLUSH_THREADS,