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| author | Yisheng Xie <xieyisheng1@huawei.com> | 2017-07-10 15:48:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-10 16:32:31 -0700 |
| commit | 78c72746f56b212ecf768a7e67cee3b7cf89238c (patch) | |
| tree | 5bbca1b54658cece57d0d326c21a5be676dcc211 /mm/vmalloc.c | |
| parent | 34c8105792731118b69582562e1178417493e65a (diff) | |
| download | linux-0-day-78c72746f56b212ecf768a7e67cee3b7cf89238c.tar.gz linux-0-day-78c72746f56b212ecf768a7e67cee3b7cf89238c.tar.xz | |
vmalloc: show lazy-purged vma info in vmallocinfo
When ioremap a 67112960 bytes vm_area with the vmallocinfo:
[..]
0xec79b000-0xec7fa000 389120 ftl_add_mtd+0x4d0/0x754 pages=94 vmalloc
0xec800000-0xecbe1000 4067328 kbox_proc_mem_write+0x104/0x1c4 phys=8b520000 ioremap
we get the result:
0xf1000000-0xf5001000 67112960 devm_ioremap+0x38/0x7c phys=40000000 ioremap
For the align for ioremap must be less than '1 << IOREMAP_MAX_ORDER':
if (flags & VM_IOREMAP)
align = 1ul << clamp_t(int, get_count_order_long(size),
PAGE_SHIFT, IOREMAP_MAX_ORDER);
So it makes idiot like me a litte puzzled why this was a jump the
vm_area from 0xec800000-0xecbe1000 to 0xf1000000-0xf5001000, and leaving
0xed000000-0xf1000000 as a big hole.
This patch is to show all of vm_area, including vmas which are freeing
but still in the vmap_area_list, to make it more clear about why we will
get 0xf1000000-0xf5001000 in the above case. And we will get a
vmallocinfo like:
[..]
0xec79b000-0xec7fa000 389120 ftl_add_mtd+0x4d0/0x754 pages=94 vmalloc
0xec800000-0xecbe1000 4067328 kbox_proc_mem_write+0x104/0x1c4 phys=8b520000 ioremap
[..]
0xece7c000-0xece7e000 8192 unpurged vm_area
0xece7e000-0xece83000 20480 vm_map_ram
0xf0099000-0xf00aa000 69632 vm_map_ram
after this patch.
Link: http://lkml.kernel.org/r/1496649682-20710-1-git-send-email-xieyisheng1@huawei.com
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: zijun_hu <zijun_hu@htc.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmalloc.c')
| -rw-r--r-- | mm/vmalloc.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 6211a807cb31e..6016ab079e2bd 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -325,6 +325,7 @@ EXPORT_SYMBOL(vmalloc_to_pfn); /*** Global kva allocator ***/ +#define VM_LAZY_FREE 0x02 #define VM_VM_AREA 0x04 static DEFINE_SPINLOCK(vmap_area_lock); @@ -1497,6 +1498,7 @@ struct vm_struct *remove_vm_area(const void *addr) spin_lock(&vmap_area_lock); va->vm = NULL; va->flags &= ~VM_VM_AREA; + va->flags |= VM_LAZY_FREE; spin_unlock(&vmap_area_lock); vmap_debug_free_range(va->va_start, va->va_end); @@ -2704,8 +2706,14 @@ static int s_show(struct seq_file *m, void *p) * s_show can encounter race with remove_vm_area, !VM_VM_AREA on * behalf of vmap area is being tear down or vm_map_ram allocation. */ - if (!(va->flags & VM_VM_AREA)) + if (!(va->flags & VM_VM_AREA)) { + seq_printf(m, "0x%pK-0x%pK %7ld %s\n", + (void *)va->va_start, (void *)va->va_end, + va->va_end - va->va_start, + va->flags & VM_LAZY_FREE ? "unpurged vm_area" : "vm_map_ram"); + return 0; + } v = va->vm; |