Messages in this thread Patch in this message | | | Date | Thu, 27 Jan 2005 18:24:13 +0000 | From | Matthias-Christian Ott <> | Subject | Re: Preempt & Xfs Question |
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Chris Wedgwood wrote:
>On Thu, Jan 27, 2005 at 05:46:54PM +0000, Matthias-Christian Ott wrote: > > > >>How did you fix it? >> >> > >I suggested: > >===== fs/xfs/linux-2.6/xfs_stats.h 1.9 vs edited ===== >Index: cw-current/fs/xfs/linux-2.6/xfs_stats.h >=================================================================== >--- cw-current.orig/fs/xfs/linux-2.6/xfs_stats.h 2005-01-17 16:03:59.656946818 -0800 >+++ cw-current/fs/xfs/linux-2.6/xfs_stats.h 2005-01-17 16:06:50.692361597 -0800 >@@ -142,9 +142,9 @@ > > /* We don't disable preempt, not too worried about poking the > * wrong cpu's stat for now */ >-#define XFS_STATS_INC(count) (__get_cpu_var(xfsstats).count++) >-#define XFS_STATS_DEC(count) (__get_cpu_var(xfsstats).count--) >-#define XFS_STATS_ADD(count, inc) (__get_cpu_var(xfsstats).count += (inc)) >+#define XFS_STATS_INC(count) (per_cpu(xfsstats, __smp_processor_id()).count++) >+#define XFS_STATS_DEC(count) (per_cpu(xfsstats, __smp_processor_id()).count--) >+#define XFS_STATS_ADD(count, inc) (per_cpu(xfsstats, __smp_processor_id()).count += (inc)) > > extern void xfs_init_procfs(void); > extern void xfs_cleanup_procfs(void); > >but what was checked in was a bit cleaner. > > > Well calling such a internal function (__function) is not a cleaning coding style but works best :-) . Combined with the current_cpu() fixes I mentioned, it looks like this:
diff -Nru linux-2.6.11-rc2/fs/xfs/linux-2.6/xfs_linux.h linux-2.6.11-rc2-ott/fs/xfs/linux-2.6/xfs_linux.h --- linux-2.6.11-rc2/fs/xfs/linux-2.6/xfs_linux.h 2004-12-24 21:35:50.000000000 +0000 +++ linux-2.6.11-rc2-ott/fs/xfs/linux-2.6/xfs_linux.h 2005-01-27 18:13:09.000000000 +0000 @@ -144,7 +144,7 @@ #define xfs_inherit_nosymlinks xfs_params.inherit_nosym.val #define xfs_rotorstep xfs_params.rotorstep.val -#define current_cpu() smp_processor_id() +#define current_cpu() __smp_processor_id() #define current_pid() (current->pid) #define current_fsuid(cred) (current->fsuid) #define current_fsgid(cred) (current->fsgid) diff -Nru linux-2.6.11-rc2/fs/xfs/linux-2.6/xfs_stats.h linux-2.6.11-rc2-ott/fs/xfs/linux-2.6/xfs_stats.h --- linux-2.6.11-rc2/fs/xfs/linux-2.6/xfs_stats.h 2004-12-24 21:34:29.000000000 +0000 +++ linux-2.6.11-rc2-ott/fs/xfs/linux-2.6/xfs_stats.h 2005-01-27 18:13:44.000000000 +0000 @@ -142,9 +142,9 @@ /* We don't disable preempt, not too worried about poking the * wrong cpu's stat for now */ -#define XFS_STATS_INC(count) (__get_cpu_var(xfsstats).count++) -#define XFS_STATS_DEC(count) (__get_cpu_var(xfsstats).count--) -#define XFS_STATS_ADD(count, inc) (__get_cpu_var(xfsstats).count += (inc)) +#define XFS_STATS_INC(count) (per_cpu(xfsstats, __smp_processor_id()).count++) +#define XFS_STATS_DEC(count) (per_cpu(xfsstats, __smp_processor_id()).count--) +#define XFS_STATS_ADD(count, inc) (per_cpu(xfsstats, __smp_processor_id()).count += (inc)) extern void xfs_init_procfs(void); extern void xfs_cleanup_procfs(void); I'll submit it to the mailinglist as a seperate patch, so Linus can apply it to the current Kernel.
Matthias-Christian Ott
-- http://unixforge.org/~matthias-christian-ott/
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