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mm: allow per-VMA locks on file-backed VMAs

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Remove the TCP layering violation by allowing per-VMA locks on all VMAs. 
The fault path will immediately fail in handle_mm_fault().  There may be a
small performance reduction from this patch as a little unnecessary work
will be done on each page fault.  See later patches for the improvement.

Link: https://lkml.kernel.org/r/20230724185410.1124082-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Cc: Arjun Roy <arjunroy@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Punit Agrawal <punit.agrawal@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2023-07-24 19:54:02 +01:00
committed by Andrew Morton
parent 284e059204
commit 350f6bbca1
5 changed files with 9 additions and 31 deletions
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17
include/linux/net_mm.h
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@@ -1,17 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifdef CONFIG_MMU
#ifdef CONFIG_INET
extern const struct vm_operations_struct tcp_vm_ops;
static inline bool vma_is_tcp(const struct vm_area_struct *vma)
{
return vma->vm_ops == &tcp_vm_ops;
}
#else
static inline bool vma_is_tcp(const struct vm_area_struct *vma)
{
return false;
}
#endif /* CONFIG_INET*/
#endif /* CONFIG_MMU */

1
include/net/tcp.h
View File

@@ -45,7 +45,6 @@
#include <linux/memcontrol.h>
#include <linux/bpf-cgroup.h>
#include <linux/siphash.h>
#include <linux/net_mm.h>
extern struct inet_hashinfo tcp_hashinfo;