From: Roman Penyaev <rpenyaev@suse.de>
To: unlisted-recipients:; (no To-header on input)
Cc: Roman Penyaev <rpenyaev@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Joe Perches <joe@perches.com>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 01/15] mm/vmalloc: add new 'alignment' field for vm_struct structure
Date: Wed, 9 Jan 2019 17:40:11 +0100 [thread overview]
Message-ID: <20190109164025.24554-2-rpenyaev@suse.de> (raw)
In-Reply-To: <20190109164025.24554-1-rpenyaev@suse.de>
I need a new alignment field for vm area in order to reallocate
previously allocated area with the same alignment.
Patch for a new vrealloc() call will follow and this new call
I want to keep as simple as possible, thus not to provide dozens
of variants, like vrealloc_user(), which cares about alignment.
Current changes are just preparations.
Worth to mention, that on archs were unsigned long is 64 bit
this new field does not bloat vm_struct, because originally
there was a padding between nr_pages and phys_addr.
Signed-off-by: Roman Penyaev <rpenyaev@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Joe Perches <joe@perches.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
---
include/linux/vmalloc.h | 1 +
mm/vmalloc.c | 10 ++++++----
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 398e9c95cd61..78210aa0bb43 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -38,6 +38,7 @@ struct vm_struct {
unsigned long flags;
struct page **pages;
unsigned int nr_pages;
+ unsigned int alignment;
phys_addr_t phys_addr;
const void *caller;
};
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index e83961767dc1..4851b4a67f55 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1347,12 +1347,14 @@ int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
EXPORT_SYMBOL_GPL(map_vm_area);
static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
- unsigned long flags, const void *caller)
+ unsigned int align, unsigned long flags,
+ const void *caller)
{
spin_lock(&vmap_area_lock);
vm->flags = flags;
vm->addr = (void *)va->va_start;
vm->size = va->va_end - va->va_start;
+ vm->alignment = align;
vm->caller = caller;
va->vm = vm;
va->flags |= VM_VM_AREA;
@@ -1399,7 +1401,7 @@ static struct vm_struct *__get_vm_area_node(unsigned long size,
return NULL;
}
- setup_vmalloc_vm(area, va, flags, caller);
+ setup_vmalloc_vm(area, va, align, flags, caller);
return area;
}
@@ -2601,8 +2603,8 @@ struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
/* insert all vm's */
for (area = 0; area < nr_vms; area++)
- setup_vmalloc_vm(vms[area], vas[area], VM_ALLOC,
- pcpu_get_vm_areas);
+ setup_vmalloc_vm(vms[area], vas[area], align,
+ VM_ALLOC, pcpu_get_vm_areas);
kfree(vas);
return vms;
--
2.19.1
next prev parent reply other threads:[~2019-01-09 16:42 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 16:40 [RFC 00/15] epoll: support pollable epoll from userspace Roman Penyaev
2019-01-09 16:40 ` Roman Penyaev [this message]
2019-01-09 16:40 ` [RFC PATCH 02/15] mm/vmalloc: move common logic from __vmalloc_area_node to a separate func Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 03/15] mm/vmalloc: introduce new vrealloc() call and its subsidiary reach analog Roman Penyaev
2019-01-09 16:50 ` Matthew Wilcox
2019-01-10 10:08 ` Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 04/15] epoll: move private helpers from a header to the source Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 05/15] epoll: introduce user header structure and user index for polling from userspace Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 06/15] epoll: introduce various of helpers for user structure lengths calculations Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 07/15] epoll: extend epitem struct with new members for polling from userspace Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 08/15] epoll: some sanity flags checks for epoll syscalls for polled epfd " Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 09/15] epoll: introduce stand-alone helpers for polling " Roman Penyaev
2019-01-09 17:29 ` Linus Torvalds
2019-01-10 10:03 ` Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 10/15] epoll: support polling from userspace for ep_insert() Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 11/15] epoll: offload polling to a work in case of epfd polled from userspace Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 12/15] epoll: support polling from userspace for ep_remove() Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 13/15] epoll: support polling from userspace for ep_modify() Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 14/15] epoll: support polling from userspace for ep_poll() Roman Penyaev
2019-01-09 16:40 ` [RFC PATCH 15/15] epoll: support mapping for epfd when polled from userspace Roman Penyaev
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