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xfs: check that per-cpu inodegc workers actually run on that cpu

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Now that we've allegedly worked out the problem of the per-cpu inodegc
workers being scheduled on the wrong cpu, let's put in a debugging knob
to let us know if a worker ever gets mis-scheduled again.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2023-05-02 09:16:12 +10:00 committed by Dave Chinner
parent 03e0add80f
commit b37c4c8339
3 changed files with 8 additions and 0 deletions
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2
fs/xfs/xfs_icache.c
View File

@ -1856,6 +1856,8 @@ xfs_inodegc_worker(
struct xfs_inode *ip, *n;
unsigned int nofs_flag;
ASSERT(gc->cpu == smp_processor_id());
WRITE_ONCE(gc->items, 0);
if (!node)

3
fs/xfs/xfs_mount.h
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@ -66,6 +66,9 @@ struct xfs_inodegc {
/* approximate count of inodes in the list */
unsigned int items;
unsigned int shrinker_hits;
#if defined(DEBUG) || defined(XFS_WARN)
unsigned int cpu;
#endif
};
/*

3
fs/xfs/xfs_super.c
View File

@ -1095,6 +1095,9 @@ xfs_inodegc_init_percpu(
for_each_possible_cpu(cpu) {
gc = per_cpu_ptr(mp->m_inodegc, cpu);
#if defined(DEBUG) || defined(XFS_WARN)
gc->cpu = cpu;
#endif
init_llist_head(&gc->list);
gc->items = 0;
INIT_DELAYED_WORK(&gc->work, xfs_inodegc_worker);