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[RFC,1/7] shmem: Introduce non-blocking allocation of shmem pages

Message ID 20250218232552.3450939-2-adrian.larumbe@collabora.com (mailing list archive)
State New
Headers show
Series [RFC,1/7] shmem: Introduce non-blocking allocation of shmem pages | expand

Commit Message

Adrián Larumbe Feb. 18, 2025, 11:25 p.m. UTC 
With the future goal of preventing deadlocks with the shrinker when reclaiming
GEM-allocated memory, a variant of shmem_read_mapping_page_gfp() that does not
sleep when enough memory isn't available, therefore potentially triggering the
shrinker on same driver, is introduced.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
 include/linux/shmem_fs.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 0b273a7b9f01..5735728aeda2 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -167,6 +167,13 @@  static inline struct page *shmem_read_mapping_page(
 					mapping_gfp_mask(mapping));
 }
 
+static inline struct page *shmem_read_mapping_page_nonblocking(
+				struct address_space *mapping, pgoff_t index)
+{
+	return shmem_read_mapping_page_gfp(mapping, index,
+					mapping_gfp_mask(mapping) | GFP_NOWAIT);
+}
+
 static inline bool shmem_file(struct file *file)
 {
 	if (!IS_ENABLED(CONFIG_SHMEM))