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Date: Thu, 20 Jul 2017 10:36:36 +0800 From: zijun_hu <zijun_hu@...o.com> To: Zhaoyang Huang <huangzhaoyang@...il.com>, zhaoyang.huang@...eadtrum.com, Andrew Morton <akpm@...ux-foundation.org>, Michal Hocko <mhocko@...e.com>, Ingo Molnar <mingo@...nel.org>, zijun_hu <zijun_hu@....com>, Vlastimil Babka <vbabka@...e.cz>, Thomas Garnier <thgarnie@...gle.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Andrey Ryabinin <aryabinin@...tuozzo.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] mm/vmalloc: add vm_struct for vm_map_ram area On 07/19/2017 06:44 PM, Zhaoyang Huang wrote: > /proc/vmallocinfo will not show the area allocated by vm_map_ram, which > will make confusion when debug. Add vm_struct for them and show them in > proc. > > Signed-off-by: Zhaoyang Huang <zhaoyang.huang@...eadtrum.com> > --- another patch titled "vmalloc: show lazy-purged vma info in vmallocinfo" was phased-in to linux-next branch to resolve this problem. > mm/vmalloc.c | 27 ++++++++++++++++++++++++++- > 1 file changed, 26 insertions(+), 1 deletion(-) > > diff --git a/mm/vmalloc.c b/mm/vmalloc.c > index 34a1c3e..4a2e93c 100644 > --- a/mm/vmalloc.c > +++ b/mm/vmalloc.c > @@ -46,6 +46,9 @@ struct vfree_deferred { > > static void __vunmap(const void *, int); > > +static void setup_vmap_ram_vm(struct vm_struct *vm, struct vmap_area *va, > + unsigned long flags, const void *caller); > + > static void free_work(struct work_struct *w) > { > struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq); > @@ -315,6 +318,7 @@ unsigned long vmalloc_to_pfn(const void *vmalloc_addr) > /*** Global kva allocator ***/ > > #define VM_VM_AREA 0x04 > +#define VM_VM_RAM 0x08 > > static DEFINE_SPINLOCK(vmap_area_lock); > /* Export for kexec only */ > @@ -1141,6 +1145,7 @@ void vm_unmap_ram(const void *mem, unsigned int count) > > va = find_vmap_area(addr); > BUG_ON(!va); > + kfree(va->vm); > free_unmap_vmap_area(va); > } > EXPORT_SYMBOL(vm_unmap_ram); > @@ -1173,6 +1178,12 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro > addr = (unsigned long)mem; > } else { > struct vmap_area *va; > + struct vm_struct *area; > + > + area = kzalloc_node(sizeof(*area), GFP_KERNEL, node); > + if (unlikely(!area)) > + return NULL; > + > va = alloc_vmap_area(size, PAGE_SIZE, > VMALLOC_START, VMALLOC_END, node, GFP_KERNEL); > if (IS_ERR(va)) > @@ -1180,6 +1191,7 @@ void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t pro > > addr = va->va_start; > mem = (void *)addr; > + setup_vmap_ram_vm(area, va, 0, __builtin_return_address(0)); > } > if (vmap_page_range(addr, addr + size, prot, pages) < 0) { > vm_unmap_ram(mem, count); > @@ -1362,6 +1374,19 @@ static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va, > spin_unlock(&vmap_area_lock); > } > > +static void setup_vmap_ram_vm(struct vm_struct *vm, struct vmap_area *va, > + 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->caller = caller; > + va->vm = vm; > + va->flags |= VM_VM_RAM; > + spin_unlock(&vmap_area_lock); > +} > + > static void clear_vm_uninitialized_flag(struct vm_struct *vm) > { > /* > @@ -2698,7 +2723,7 @@ 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 | VM_VM_RAM))) > return 0; > > v = va->vm; >
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