tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
writeback: add some debug inode list counters to bdi stats
Add some debug entries to be able to inspect the internal state of
the writeback details.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
+34
-4
+34
-4
mm/backing-dev.c
+34
-4
mm/backing-dev.c
···
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static int bdi_debug_stats_show(struct seq_file *m, void *v)
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{
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struct backing_dev_info *bdi = m->private;
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+
struct bdi_writeback *wb;
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unsigned long background_thresh;
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unsigned long dirty_thresh;
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unsigned long bdi_thresh;
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unsigned long nr_dirty, nr_io, nr_more_io, nr_wb;
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struct inode *inode;
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+
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/*
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* inode lock is enough here, the bdi->wb_list is protected by
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* RCU on the reader side
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*/
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nr_wb = nr_dirty = nr_io = nr_more_io = 0;
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spin_lock(&inode_lock);
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list_for_each_entry(wb, &bdi->wb_list, list) {
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nr_wb++;
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list_for_each_entry(inode, &wb->b_dirty, i_list)
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nr_dirty++;
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list_for_each_entry(inode, &wb->b_io, i_list)
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nr_io++;
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list_for_each_entry(inode, &wb->b_more_io, i_list)
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nr_more_io++;
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}
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spin_unlock(&inode_lock);
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get_dirty_limits(&background_thresh, &dirty_thresh, &bdi_thresh, bdi);
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···
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"BdiReclaimable: %8lu kB\n"
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"BdiDirtyThresh: %8lu kB\n"
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"DirtyThresh: %8lu kB\n"
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-
"BackgroundThresh: %8lu kB\n",
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"BackgroundThresh: %8lu kB\n"
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"WriteBack threads:%8lu\n"
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"b_dirty: %8lu\n"
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"b_io: %8lu\n"
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"b_more_io: %8lu\n"
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"bdi_list: %8u\n"
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"state: %8lx\n"
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"wb_mask: %8lx\n"
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"wb_list: %8u\n"
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"wb_cnt: %8u\n",
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(unsigned long) K(bdi_stat(bdi, BDI_WRITEBACK)),
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(unsigned long) K(bdi_stat(bdi, BDI_RECLAIMABLE)),
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K(bdi_thresh),
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K(dirty_thresh),
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K(background_thresh));
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K(bdi_thresh), K(dirty_thresh),
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K(background_thresh), nr_wb, nr_dirty, nr_io, nr_more_io,
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!list_empty(&bdi->bdi_list), bdi->state, bdi->wb_mask,
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!list_empty(&bdi->wb_list), bdi->wb_cnt);
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#undef K
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return 0;