On 02/13/2018 11:17 AM, Cyrill Gorcunov wrote:
To restore big slabs of memory (more than 1G) via pipes we need
pipes to be able to carry such sizes, for this sake Andrey propose
to use kvmalloc calls. Looking into the code I didn't find a reason
why we can't do so, thus here is a patch.
https://jira.sw.ru/browse/PSBM-69201
CC: Andrey Vagin <ava...@virtuozzo.com>
CC: Andrey Ryabinin <aryabi...@virtuozzo.com>
CC: Konstantin Khorenko <khore...@virtuozzo.com>
CC: "Denis V. Lunev" <d...@virtuozzo.com>
Signed-off-by: Cyrill Gorcunov <gorcu...@virtuozzo.com>
---
Note I wrapped the calls with CONFIG_VE for a while.
Note, i dropped ifdef CONFIG_VE wrappers.
fs/pipe.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
Index: linux-pcs7.git/fs/pipe.c
===================================================================
--- linux-pcs7.git.orig/fs/pipe.c
+++ linux-pcs7.git/fs/pipe.c
@@ -845,7 +845,11 @@ struct pipe_inode_info *alloc_pipe_info(
if (!too_many_pipe_buffers_hard(user)) {
if (too_many_pipe_buffers_soft(user))
pipe_bufs = 1;
+#ifdef CONFIG_VE
+ pipe->bufs = kvmalloc(sizeof(struct pipe_buffer) *
pipe_bufs, GFP_KERNEL | __GFP_ZERO);
+#else
pipe->bufs = kzalloc(sizeof(struct pipe_buffer) *
pipe_bufs, GFP_KERNEL);
+#endif
}
if (pipe->bufs) {
@@ -877,7 +881,11 @@ void free_pipe_info(struct pipe_inode_in
}
if (pipe->tmp_page)
__free_page(pipe->tmp_page);
+#ifdef CONFIG_VE
+ kvfree(pipe->bufs);
+#else
kfree(pipe->bufs);
+#endif
kfree(pipe);
}
@@ -1235,7 +1243,11 @@ static long pipe_set_size(struct pipe_in
if (nr_pages < pipe->nrbufs)
return -EBUSY;
+#ifdef CONFIG_VE
+ bufs = kvmalloc(nr_pages * sizeof(*bufs), GFP_KERNEL | __GFP_NOWARN |
__GFP_ZERO);
+#else
bufs = kcalloc(nr_pages, sizeof(*bufs), GFP_KERNEL | __GFP_NOWARN);
+#endif
if (unlikely(!bufs))
return -ENOMEM;
@@ -1262,7 +1274,11 @@ static long pipe_set_size(struct pipe_in
account_pipe_buffers(pipe, pipe->buffers, nr_pages);
pipe->curbuf = 0;
+#ifdef CONFIG_VE
+ kvfree(pipe->bufs);
+#else
kfree(pipe->bufs);
+#endif
pipe->bufs = bufs;
pipe->buffers = nr_pages;
return nr_pages * PAGE_SIZE;
.
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