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ttm/pool: Use sentinels in debugfs

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The values in the `page_pool_shrink` debugfs file should recognize
the sentinels rather than causing an underflow.

Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5218
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Link: https://patch.msgid.link/20260427162253.682415-1-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <superm1@kernel.org>
This commit is contained in:
Mario Limonciello
2026-04-27 11:22:53 -05:00
committed by Mario Limonciello
parent 723a2a698f
commit 811a8d6f2c
1 changed files with 10 additions and 3 deletions
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13
drivers/gpu/drm/ttm/ttm_pool.c
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@@ -1355,15 +1355,22 @@ static int ttm_pool_debugfs_shrink_show(struct seq_file *m, void *data)
.gfp_mask = GFP_NOFS,
.nr_to_scan = TTM_SHRINKER_BATCH,
};
unsigned long count;
unsigned long count, scanned;
int nid;
fs_reclaim_acquire(GFP_KERNEL);
for_each_node(nid) {
sc.nid = nid;
count = ttm_pool_shrinker_count(mm_shrinker, &sc);
seq_printf(m, "%d: %lu/%lu\n", nid, count,
ttm_pool_shrinker_scan(mm_shrinker, &sc));
scanned = ttm_pool_shrinker_scan(mm_shrinker, &sc);
/* Convert shrinker API sentinel values to 0 for debugfs output */
if (count == SHRINK_EMPTY)
count = 0;
if (scanned == SHRINK_STOP)
scanned = 0;
seq_printf(m, "%d: %lu/%lu\n", nid, count, scanned);
}
fs_reclaim_release(GFP_KERNEL);