Accompanies [PATCH] makedumpfile: request the kernel do page scans
This patch moves the scanning of page tables into the kernel.
The makedumpfile command makes requests by writes to /proc/vmcore_pfn_lists
and this code writes a list of PFN's back to it.
This is experimental code. It is tested on SGI UV machines, but not yet
proposed to the linux kernel community.
Diffed against linux-next (3.7.0-rc5-next-20121115-uv+)
Signed-off-by: Cliff Wickman <cpw at sgi.com>
---
fs/proc/vmcore.c | 558 +++++++++++++++++++++++++++++++++++++++++++
include/linux/makedumpfile.h | 115 ++++++++
2 files changed, 673 insertions(+)
Index: linux/fs/proc/vmcore.c
===================================================================
--- linux.orig/fs/proc/vmcore.c
+++ linux/fs/proc/vmcore.c
@@ -19,8 +19,18 @@
#include <linux/init.h>
#include <linux/crash_dump.h>
#include <linux/list.h>
+#include <linux/makedumpfile.h>
+#include <linux/mmzone.h>
#include <asm/uaccess.h>
#include <asm/io.h>
+#include <asm/page.h>
+static int num_mem_map_data = 0;
+static struct mem_map_data *mem_map_data;
+static struct pfn_element *pfn_list;
+static long in_pfn_list;
+static int last_found_vaddr = 0;
+static int last_found_paddr = 0;
+static int max_pfn_list;
/* List representing chunks of contiguous memory areas and their offsets in
* vmcore file.
@@ -35,6 +45,7 @@ static size_t elfcorebuf_sz;
static u64 vmcore_size;
static struct proc_dir_entry *proc_vmcore = NULL;
+static struct proc_dir_entry *proc_vmcore_pfn_lists = NULL;
/*
* Returns > 0 for RAM pages, 0 for non-RAM pages, < 0 on error
@@ -208,11 +219,554 @@ static ssize_t read_vmcore(struct file *
return acc;
}
+/*
+ * Given the boot-kernel-relative virtual address of a page
+ * return its crashkernel-relative virtual address.
+ *
+ * We have a memory map named mem_map_data
+ *
+ * return 0 if it cannot be found
+ */
+unsigned long
+find_local_vaddr(unsigned long orig_vaddr)
+{
+ int i;
+ int fnd = 0;
+ struct mem_map_data *mmd, *next_mmd;
+ unsigned long paddr;
+ unsigned long local_vaddr;
+ unsigned long offset;
+
+ if (!num_mem_map_data) {
+ printk("find_page_paddr !! num_mem_map_data is %d\n",
+ num_mem_map_data);
+ return 0;
+ }
+
+fullsearch:
+ for (i = last_found_vaddr, mmd = mem_map_data + last_found_vaddr,
+ next_mmd = mem_map_data + last_found_vaddr + 1;
+ i < num_mem_map_data; i++, mmd++, next_mmd++) {
+ if (mmd->mem_map && mmd->paddr) {
+ if (orig_vaddr >= mmd->mem_map &&
+ orig_vaddr < next_mmd->mem_map) {
+ offset = orig_vaddr - mmd->mem_map;
+ paddr = mmd->paddr + offset;
+ fnd++;
+ /* caching gives about 99% hit on first pass */
+ last_found_vaddr = i;
+ break;
+ }
+ }
+ }
+
+ if (! fnd) {
+ if (last_found_vaddr > 0) {
+ last_found_vaddr = 0;
+ goto fullsearch;
+ }
+ return 0;
+ }
+
+ /* paddr is now the physical address of the page structure */
+ /* and offset is the offset into the found section, and we have
+ a table of how those sections are ioremap_cache'd */
+ local_vaddr = (unsigned long)mmd->section_vaddr + offset;
+ return local_vaddr;
+}
+
+/*
+ * Given a paddr, return its crashkernel-relative virtual address.
+ *
+ * We have a memory map named mem_map_data
+ *
+ * return 0 if it cannot be found
+ */
+void *
+find_local_from_paddr(unsigned long paddr)
+{
+ int i;
+ struct mem_map_data *mmd;
+ unsigned long offset;
+
+ if (!num_mem_map_data) {
+ printk("find_page_paddr !! num_mem_map_data is %d\n",
+ num_mem_map_data);
+ return 0;
+ }
+
+fullsearch:
+ for (i = last_found_paddr, mmd = mem_map_data + last_found_paddr;
+ i < num_mem_map_data; i++, mmd++) {
+ if ((paddr >= mmd->paddr) && (paddr < mmd->ending_paddr)) {
+ offset = paddr - mmd->paddr;
+ last_found_paddr = i;
+ /* caching gives about 98% hit on first pass */
+ return (void *)(mmd->section_vaddr + offset);
+ }
+ }
+
+ if (last_found_paddr > 0) {
+ last_found_paddr = 0;
+ goto fullsearch;
+ }
+ return 0;
+}
+
+/*
+ * given an anchoring list_head, walk the list of free pages
+ * 'root' is a virtual address based on the ioremap_cache'd pointer pgp
+ * 'boot_root' is the virtual address of the list root, boot kernel relative
+ *
+ * return the number of pages found on the list
+ */
+int
+walk_freelist(struct list_head *root, int node, int zone, int order, int list,
+ int restart_list, int start_page, struct pfn_list_request *reqp,
+ struct pfn_reply *replyp, struct list_head *boot_root)
+{
+ int list_ct = 0;
+ int list_free_pages = 0;
+ int doit;
+ unsigned long start_pfn;
+ struct page *pagep;
+ struct page *local_pagep;
+ struct list_head *lhp;
+ struct list_head *local_lhp; /* crashkernel-relative */
+ struct list_head *prev;
+ struct pfn_element *pe;
+
+ /*
+ * root is the crashkernel-relative address of the anchor of the
+ * free_list.
+ */
+ prev = root;
+ if (root == NULL) {
+ printk(KERN_EMERG "root is null!!, node %d order %d\n",
+ node, order);
+ return 0;
+ }
+
+ if (root->next == boot_root)
+ /* list is empty */
+ return 0;
+
+ lhp = root->next;
+ local_lhp = (struct list_head *)find_local_vaddr((unsigned long)lhp);
+ if (!local_lhp) {
+ return 0;
+ }
+
+ while (local_lhp != boot_root) {
+ list_ct++;
+ if (lhp == NULL) {
+ printk(KERN_EMERG
+ "The free list has a null!!, node %d order %d\n",
+ node, order);
+ break;
+ }
+ if (list_ct > 1 && local_lhp->prev != prev) {
+ /* can't be compared to root, as that is local */
+ printk(KERN_EMERG "The free list is broken!!\n");
+ break;
+ }
+
+ /* we want the boot kernel's pfn that this page represents */
+ pagep = container_of((struct list_head *)lhp,
+ struct page, lru);
+ start_pfn = pagep - vmemmap;
+ local_pagep = container_of((struct list_head *)local_lhp,
+ struct page, lru);
+ doit = 1;
+ if (restart_list && list_ct < start_page)
+ doit = 0;
+ if (doit) {
+ if (in_pfn_list == max_pfn_list) {
+ /* if array would overflow, come back to
+ this page with a continuation */
+ replyp->more = 1;
+ replyp->zone_index = zone;
+ replyp->freearea_index = order;
+ replyp->type_index = list;
+ replyp->list_ct = list_ct;
+ goto list_is_full;
+ }
+ pe = &pfn_list[in_pfn_list++];
+ pe->pfn = start_pfn;
+ pe->order = order;
+ list_free_pages += (1 << order);
+ }
+ prev = lhp;
+ lhp = local_pagep->lru.next;
+ /* the local node-relative vaddr: */
+ local_lhp = (struct list_head *)
+ find_local_vaddr((unsigned long)lhp);
+ if (!local_lhp)
+ break;
+ }
+
+list_is_full:
+ return list_free_pages;
+}
+
+/*
+ * Return the pfns of free pages on this node
+ */
+int
+write_vmcore_get_free(struct pfn_list_request *reqp)
+{
+ int node;
+ int nr_zones;
+ int nr_orders = MAX_ORDER;
+ int nr_freelist = MIGRATE_TYPES;
+ int zone;
+ int order;
+ int list;
+ int start_zone = 0;
+ int start_order = 0;
+ int start_list = 0;
+ int ret;
+ int restart = 0;
+ int start_page = 0;
+ int node_free_pages = 0;
+ struct pfn_reply rep;
+ struct pglist_data *pgp;
+ struct zone *zonep;
+ struct free_area *fap;
+ struct list_head *flp;
+ struct list_head *boot_root;
+ unsigned long pgdat_paddr;
+ unsigned long pgdat_vaddr;
+ unsigned long page_aligned_pgdat;
+ unsigned long page_aligned_size;
+ void *mapped_vaddr;
+
+ node = reqp->node;
+ pgdat_paddr = reqp->pgdat_paddr;
+ pgdat_vaddr = reqp->pgdat_vaddr;
+
+ /* map this pglist_data structure within a page-aligned area */
+ page_aligned_pgdat = pgdat_paddr & ~(PAGE_SIZE - 1);
+ page_aligned_size = sizeof(struct pglist_data) +
+ (pgdat_paddr - page_aligned_pgdat);
+ page_aligned_size = ((page_aligned_size + (PAGE_SIZE - 1))
+ >> PAGE_SHIFT) << PAGE_SHIFT;
+ mapped_vaddr = ioremap_cache(page_aligned_pgdat, page_aligned_size);
+ if (!mapped_vaddr) {
+ printk("ioremap_cache of pgdat %#lx failed\n",
+ page_aligned_pgdat);
+ return -EINVAL;
+ }
+ pgp = (struct pglist_data *)(mapped_vaddr +
+ (pgdat_paddr - page_aligned_pgdat));
+ nr_zones = pgp->nr_zones;
+ memset(&rep, 0, sizeof(rep));
+
+ if (reqp->more) {
+ restart = 1;
+ start_zone = reqp->zone_index;
+ start_order = reqp->freearea_index;
+ start_list = reqp->type_index;
+ start_page = reqp->list_ct;
+ }
+
+ in_pfn_list = 0;
+ for (zone = start_zone; zone < nr_zones; zone++) {
+ zonep = &pgp->node_zones[zone];
+ for (order = start_order; order < nr_orders; order++) {
+ fap = &zonep->free_area[order];
+ /* some free_area's are all zero */
+ if (fap->nr_free) {
+ for (list = start_list; list < nr_freelist;
+ list++) {
+ flp = &fap->free_list[list];
+ boot_root = (struct list_head *)
+ (pgdat_vaddr +
+ ((unsigned long)flp -
+ (unsigned long)pgp));
+ ret = walk_freelist(flp, node, zone,
+ order, list, restart,
+ start_page, reqp, &rep,
+ boot_root);
+ node_free_pages += ret;
+ restart = 0;
+ if (rep.more)
+ goto list_full;
+ }
+ }
+ }
+ }
+list_full:
+
+ iounmap(mapped_vaddr);
+
+ /* copy the reply and the valid part of our pfn list to the user */
+ rep.pfn_free = node_free_pages; /* the total, for statistics */
+ rep.in_pfn_list = in_pfn_list;
+ if (copy_to_user(reqp->reply_ptr, &rep, sizeof(struct pfn_reply)))
+ return -EFAULT;
+ if (in_pfn_list) {
+ if (copy_to_user(reqp->pfn_list_ptr, pfn_list,
+ (in_pfn_list * sizeof(struct pfn_element))))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+/*
+ * Get the memap_data table from makedumpfile
+ * and do the single allocate of the pfn_list.
+ */
+int
+write_vmcore_get_memmap(struct pfn_list_request *reqp)
+{
+ int i;
+ int count;
+ int size;
+ int ret = 0;
+ long pfn_list_elements;
+ long malloc_size;
+ unsigned long page_section_start;
+ unsigned long page_section_size;
+ struct mem_map_data *mmd, *dum_mmd;
+ struct pfn_reply rep;
+ void *bufptr;
+
+ rep.pfn_list_elements = 0;
+ if (num_mem_map_data) {
+ /* shouldn't have been done before, but if it was.. */
+ printk(KERN_INFO "warning: PL_REQUEST_MEMMAP is repeated\n");
+ for (i = 0, mmd = mem_map_data; i < num_mem_map_data;
+ i++, mmd++) {
+ iounmap(mmd->section_vaddr);
+ }
+ kfree(mem_map_data);
+ mem_map_data = NULL;
+ num_mem_map_data = 0;
+ kfree(pfn_list);
+ pfn_list = NULL;
+ }
+
+ count = reqp->map_count;
+ size = reqp->map_size;
+ bufptr = reqp->map_ptr;
+ if (size != (count * sizeof(struct mem_map_data))) {
+ printk("Error in mem_map_data, %d * %ld != %d\n",
+ count, sizeof(struct mem_map_data), size);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ /* add a dummy at the end to limit the size of the last entry */
+ size += sizeof(struct mem_map_data);
+
+ mem_map_data = kzalloc(size, GFP_KERNEL);
+ if (!mem_map_data) {
+ printk("kmalloc of mem_map_data for %d failed\n", size);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (copy_from_user(mem_map_data, bufptr, size)) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ num_mem_map_data = count;
+
+ /* construct the dummy entry to limit the size of 'next_mmd->mem_map' */
+ /* (see find_local_vaddr() ) */
+ mmd = mem_map_data + (num_mem_map_data - 1);
+ page_section_size = (mmd->pfn_end - mmd->pfn_start) *
+ sizeof(struct page);
+ dum_mmd = mmd + 1;
+ *dum_mmd = *mmd;
+ dum_mmd->mem_map += page_section_size;
+
+ /* Fill in the ending address of array of page struct */
+ for (i = 0, mmd = mem_map_data; i < num_mem_map_data; i++, mmd++) {
+ mmd->ending_paddr = mmd->paddr +
+ ((mmd->pfn_end - mmd->pfn_start) * sizeof(struct page));
+ }
+
+ /* Map each section of page structures to local virtual addresses */
+ /* (these are never iounmap'd, as this is the crash kernel) */
+ for (i = 0, mmd = mem_map_data; i < num_mem_map_data; i++, mmd++) {
+ page_section_start = mmd->paddr;
+ page_section_size = (mmd->pfn_end - mmd->pfn_start) *
+ sizeof(struct page);
+ mmd->section_vaddr = ioremap_cache(page_section_start,
+ page_section_size);
+ if (!mmd->section_vaddr) {
+ printk(
+ "ioremap_cache of [%d] node %#lx for %#lx failed\n",
+ i, page_section_start, page_section_size);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ /*
+ * allocate the array for PFN's (just once)
+ * get as much as we can, up to what the user specified, and return
+ * that count to the user
+ */
+ pfn_list_elements = reqp->list_size;
+ do {
+ malloc_size = pfn_list_elements * sizeof(struct pfn_element);
+ if ((pfn_list = kmalloc(malloc_size, GFP_KERNEL)) != NULL) {
+ rep.pfn_list_elements = pfn_list_elements;
+ max_pfn_list = pfn_list_elements;
+ goto out;
+ }
+ pfn_list_elements -= 1000;
+ } while (pfn_list == NULL && pfn_list_elements > 0);
+
+ ret = -EINVAL;
+out:
+ if (copy_to_user(reqp->reply_ptr, &rep, sizeof(struct pfn_reply)))
+ return -EFAULT;
+ return ret;
+}
+
+/*
+ * Return the pfns of to-be-excluded pages fulfilling this request.
+ * This is called for each mem_map in makedumpfile's list.
+ */
+int
+write_vmcore_get_excludes(struct pfn_list_request *reqp)
+{
+ int i;
+ int start = 0;
+ int end;
+ unsigned long paddr;
+ unsigned long pfn;
+ void *vaddr;
+ struct page *pagep;
+ struct pfn_reply rep;
+ struct pfn_element *pe;
+
+ if (!num_mem_map_data) {
+ /* sanity check */
+ printk(
+ "ERROR:PL_REQUEST_MEMMAP not done before PL_REQUEST_EXCLUDE\n");
+ return -EINVAL;
+ }
+
+ /*
+ * the request contains (besides request type and bufptr):
+ * paddr (physical address of the page[0]
+ * count of pages in the block
+ * exclude bits (DL_EXCLUDE_...)
+ */
+ paddr = reqp->paddr;
+ end = reqp->count;
+ pfn = reqp->pfn_start;
+ /* find the already-mapped vaddr of this paddr */
+ vaddr = find_local_from_paddr(paddr);
+ if (!vaddr) {
+ printk("ERROR: PL_REQUEST_EXCLUDE cannot find paddr %#lx\n",
+ paddr);
+ return -EINVAL;
+ }
+ if (reqp->more) {
+ start = reqp->map_index;
+ vaddr += (reqp->map_index * sizeof(struct page));
+ pfn += reqp->map_index;
+ }
+ memset(&rep, 0, sizeof(rep));
+ in_pfn_list = 0;
+
+ for (i = start, pagep = (struct page *)vaddr; i < end;
+ i++, pagep++, pfn++) {
+ if (in_pfn_list == max_pfn_list) {
+ rep.more = 1;
+ rep.map_index = i;
+ break;
+ }
+ /*
+ * Exclude the cache page without the private page.
+ */
+ if ((reqp->exclude_bits & DL_EXCLUDE_CACHE)
+ && (isLRU(pagep->flags) || isSwapCache(pagep->flags))
+ && !isPrivate(pagep->flags) && !isAnon(pagep->mapping)) {
+ pe = &pfn_list[in_pfn_list++];
+ pe->pfn = pfn;
+ pe->order = 0; /* assume 4k */
+ rep.pfn_cache++;
+ }
+ /*
+ * Exclude the cache page with the private page.
+ */
+ else if ((reqp->exclude_bits & DL_EXCLUDE_CACHE_PRI)
+ && (isLRU(pagep->flags) || isSwapCache(pagep->flags))
+ && !isAnon(pagep->mapping)) {
+ pe = &pfn_list[in_pfn_list++];
+ pe->pfn = pfn;
+ pe->order = 0; /* assume 4k */
+ rep.pfn_cache_private++;
+ }
+ /*
+ * Exclude the data page of the user process.
+ */
+ else if ((reqp->exclude_bits & DL_EXCLUDE_USER_DATA)
+ && isAnon(pagep->mapping)) {
+ pe = &pfn_list[in_pfn_list++];
+ pe->pfn = pfn;
+ pe->order = 0; /* assume 4k */
+ rep.pfn_user++;
+ }
+
+ }
+ rep.in_pfn_list = in_pfn_list;
+ if (copy_to_user(reqp->reply_ptr, &rep, sizeof(struct pfn_reply)))
+ return -EFAULT;
+ if (in_pfn_list) {
+ if (copy_to_user(reqp->pfn_list_ptr, pfn_list,
+ (in_pfn_list * sizeof(struct pfn_element))))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static ssize_t write_vmcore_pfn_lists(struct file *file,
+ const char __user *user_buf, size_t count, loff_t *ppos)
+{
+ int ret;
+ struct pfn_list_request pfn_list_request;
+
+ if (count != sizeof(struct pfn_list_request)) {
+ return -EINVAL;
+ }
+
+ if (copy_from_user(&pfn_list_request, user_buf, count))
+ return -EFAULT;
+
+ if (pfn_list_request.request == PL_REQUEST_FREE) {
+ ret = write_vmcore_get_free(&pfn_list_request);
+ } else if (pfn_list_request.request == PL_REQUEST_EXCLUDE) {
+ ret = write_vmcore_get_excludes(&pfn_list_request);
+ } else if (pfn_list_request.request == PL_REQUEST_MEMMAP) {
+ ret = write_vmcore_get_memmap(&pfn_list_request);
+ } else {
+ return -EINVAL;
+ }
+
+ if (ret)
+ return ret;
+ return count;
+}
+
+
static const struct file_operations proc_vmcore_operations = {
.read = read_vmcore,
.llseek = default_llseek,
};
+static const struct file_operations proc_vmcore_pfn_lists_operations = {
+ .write = write_vmcore_pfn_lists,
+};
+
static struct vmcore* __init get_new_element(void)
{
return kzalloc(sizeof(struct vmcore), GFP_KERNEL);
@@ -697,6 +1251,10 @@ static int __init vmcore_init(void)
proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &proc_vmcore_operations);
if (proc_vmcore)
proc_vmcore->size = vmcore_size;
+
+ proc_vmcore_pfn_lists = proc_create("vmcore_pfn_lists", S_IWUSR, NULL,
+ &proc_vmcore_pfn_lists_operations);
+
return 0;
}
module_init(vmcore_init)
Index: linux/include/linux/makedumpfile.h
===================================================================
--- /dev/null
+++ linux/include/linux/makedumpfile.h
@@ -0,0 +1,115 @@
+/*
+ * makedumpfile.h
+ * portions Copyright (C) 2006, 2007, 2008, 2009 NEC Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define isLRU(flags) (flags & (1UL << PG_lru))
+#define isPrivate(flags) (flags & (1UL << PG_private))
+#define isSwapCache(flags) (flags & (1UL << PG_swapcache))
+
+static inline int
+isAnon(struct address_space *mapping)
+{
+ return ((unsigned long)mapping & PAGE_MAPPING_ANON) != 0;
+}
+
+#define DL_EXCLUDE_ZERO (0x001) /* Exclude Pages filled with Zeros */
+#define DL_EXCLUDE_CACHE (0x002) /* Exclude Cache Pages
+ without Private Pages */
+#define DL_EXCLUDE_CACHE_PRI (0x004) /* Exclude Cache Pages
+ with Private Pages */
+#define DL_EXCLUDE_USER_DATA (0x008) /* Exclude UserProcessData Pages */
+#define DL_EXCLUDE_FREE (0x010) /* Exclude Free Pages */
+
+#define PL_REQUEST_FREE 1 /* request for a list of free pages */
+#define PL_REQUEST_EXCLUDE 2 /* request for a list of excludable
+ pages */
+#define PL_REQUEST_MEMMAP 3 /* request to pass in the makedumpfile
+ mem_map_data table */
+/*
+ * a request for finding pfn's that can be excluded from the dump
+ * they may be pages of particular types or free pages
+ */
+struct pfn_list_request {
+ int request; /* PL_REQUEST_FREE PL_REQUEST_EXCLUDE or */
+ /* PL_REQUEST_MEMMAP */
+ int debug;
+ unsigned long paddr; /* mem_map address for PL_REQUEST_EXCLUDE */
+ unsigned long pfn_start;/* pfn represented by paddr */
+ unsigned long pgdat_paddr; /* for PL_REQUEST_FREE */
+ unsigned long pgdat_vaddr; /* for PL_REQUEST_FREE */
+ int node; /* for PL_REQUEST_FREE */
+ int exclude_bits; /* for PL_REQUEST_EXCLUDE */
+ int count; /* for PL_REQUEST_EXCLUDE */
+ void *reply_ptr; /* address of user's pfn_reply, for reply */
+ void *pfn_list_ptr; /* address of user's pfn array (*pfn_list) */
+ int map_count; /* for PL_REQUEST_MEMMAP; elements */
+ int map_size; /* for PL_REQUEST_MEMMAP; bytes in table */
+ void *map_ptr; /* for PL_REQUEST_MEMMAP; address of table */
+ long list_size; /* for PL_REQUEST_MEMMAP negotiation */
+ /* resume info: */
+ int more; /* 0 for done, 1 for "there's more" */
+ /* PL_REQUEST_EXCLUDE: */
+ int map_index; /* slot in the mem_map array of page structs */
+ /* PL_REQUEST_FREE: */
+ int zone_index; /* zone within the node's pgdat_list */
+ int freearea_index; /* free_area within the zone */
+ int type_index; /* free_list within the free_area */
+ int list_ct; /* page within the list */
+};
+
+/*
+ * the reply from a pfn_list_request
+ * the list of pfn's itself is pointed to by pfn_list
+ */
+struct pfn_reply {
+ long pfn_list_elements; /* negotiated on PL_REQUEST_MEMMAP */
+ long in_pfn_list; /* returned by PL_REQUEST_EXCLUDE and
+ PL_REQUEST_FREE */
+ /* resume info */
+ int more; /* 0 == done, 1 == there is more */
+ /* PL_REQUEST_MEMMAP: */
+ int map_index; /* slot in the mem_map array of page structs */
+ /* PL_REQUEST_FREE: */
+ int zone_index; /* zone within the node's pgdat_list */
+ int freearea_index; /* free_area within the zone */
+ int type_index; /* free_list within the free_area */
+ int list_ct; /* page within the list */
+ /* statistic counters: */
+ unsigned long long pfn_cache; /* PL_REQUEST_EXCLUDE */
+ unsigned long long pfn_cache_private; /* PL_REQUEST_EXCLUDE */
+ unsigned long long pfn_user; /* PL_REQUEST_EXCLUDE */
+ unsigned long long pfn_free; /* PL_REQUEST_FREE */
+};
+
+struct pfn_element {
+ unsigned long pfn;
+ unsigned long order;
+};
+
+struct mem_map_data {
+ /*
+ * pfn_start/pfn_end are the pfn's represented by this mem_map entry.
+ * mem_map is the virtual address of the array of page structures
+ * that represent this pages.
+ * paddr is the physical address of that array of structures.
+ * ending_paddr would be (pfn_end - pfn_start) * sizeof(struct page).
+ * section_vaddr is the address we get from ioremap_cache().
+ */
+ unsigned long long pfn_start;
+ unsigned long long pfn_end;
+ unsigned long mem_map;
+ unsigned long long paddr; /* filled in by makedumpfile */
+ unsigned long long ending_paddr; /* filled in by kernel */
+ void *section_vaddr; /* filled in by kernel */
+};
