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| author | ZhangPeng <zhangpeng362@huawei.com> | 2024-01-09 15:04:56 +0800 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2024-02-28 05:31:38 -0800 |
| commit | 02e765697038c596dc4a1126a13b018608365d81 (patch) | |
| tree | c726728ee0a1ca0d78920ecbb3d384086b098ad7 /include/linux/swiotlb.h | |
| parent | cf1182944c7cc9f1c21a8a44e0d29abe12527412 (diff) | |
| download | lwn-02e765697038c596dc4a1126a13b018608365d81.tar.gz lwn-02e765697038c596dc4a1126a13b018608365d81.zip | |
swiotlb: add debugfs to track swiotlb transient pool usage
Introduce a new debugfs interface io_tlb_transient_nslabs. The device
driver can create a new swiotlb transient memory pool once default
memory pool is full. To export the swiotlb transient memory pool usage
via debugfs would help the user estimate the size of transient swiotlb
memory pool or analyze device driver memory leak issue.
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/swiotlb.h')
| -rw-r--r-- | include/linux/swiotlb.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index ecde0312dd52..ea23097e351f 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -120,6 +120,8 @@ struct io_tlb_pool { * debugfs. * @used_hiwater: The high water mark for total_used. Used only for reporting * in debugfs. + * @transient_nslabs: The total number of slots in all transient pools that + * are currently used across all areas. */ struct io_tlb_mem { struct io_tlb_pool defpool; @@ -137,6 +139,7 @@ struct io_tlb_mem { #ifdef CONFIG_DEBUG_FS atomic_long_t total_used; atomic_long_t used_hiwater; + atomic_long_t transient_nslabs; #endif }; |