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This patch is for ready kernel only. For new release the following patch should be used.</div>
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<span style="font-weight: 600;">[PATCH VZ9] fs/fuse kio: Refactor pcs_mr to avoid large contiguous memory allocation</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Liu Kui <kui.liu@virtuozzo.com><br>
<b>Sent:</b> 01 August 2025 20:55<br>
<b>To:</b> devel@openvz.org <devel@openvz.org><br>
<b>Cc:</b> Alexey Kuznetsov <kuznet@virtuozzo.com>; Andrey Zaitsev <azaitsev@virtuozzo.com>; Konstantin Khorenko <khorenko@virtuozzo.com>; Kui Liu <kui.liu@virtuozzo.com><br>
<b>Subject:</b> [PATCH VZ9] fs/fuse kio: Use kvcalloc to prevent failure in fragmented systems</font>
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<div class="PlainText">Address large memory allocation failure by replacing kcalloc with<br>
kvcalloc. This allows fallback to vmalloc for large allocations,<br>
as virtually contiguous meomory is sufficient here, improving<br>
reliability in highly fragmented systems<br>
<br>
Related to: #VSTOR-112413<br>
<a href="https://virtuozzo.atlassian.net/browse/VSTOR-112413">https://virtuozzo.atlassian.net/browse/VSTOR-112413</a><br>
<br>
Signed-off-by: Liu Kui <kui.liu@virtuozzo.com><br>
---<br>
fs/fuse/kio/pcs/pcs_mr.c | 4 ++--<br>
1 file changed, 2 insertions(+), 2 deletions(-)<br>
<br>
diff --git a/fs/fuse/kio/pcs/pcs_mr.c b/fs/fuse/kio/pcs/pcs_mr.c<br>
index cbd3b440dd1b..28e04d1b2639 100644<br>
--- a/fs/fuse/kio/pcs/pcs_mr.c<br>
+++ b/fs/fuse/kio/pcs/pcs_mr.c<br>
@@ -17,7 +17,7 @@ void pcs_umem_release(struct pcs_umem *umem)<br>
unpin_user_pages(umem->pages, umem->npages);<br>
atomic64_sub(umem->npages, &mm_s->pinned_vm);<br>
mmdrop(mm_s);<br>
- kfree(umem->pages);<br>
+ kvfree(umem->pages);<br>
kfree(umem);<br>
}<br>
<br>
@@ -48,7 +48,7 @@ struct pcs_umem *pcs_umem_get(u64 start, u64 len)<br>
mmap_read_lock(mm_s);<br>
<br>
umem->fp_addr = fp_va;<br>
- umem->pages = kcalloc(npages, sizeof(struct page *), GFP_KERNEL);<br>
+ umem->pages = kvcalloc(npages, sizeof(struct page *), GFP_KERNEL);<br>
if (!umem->pages) {<br>
ret = -ENOMEM;<br>
goto out_err;<br>
-- <br>
2.39.5 (Apple Git-154)<br>
<br>
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