Attachment 633710 Details for Bug 870326 – reproducer v1

reproducer v1

mpages.c (text/plain), 1.64 KB, created by Jan Stancek on 2012-10-26 07:51:18 UTC

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Creator: Jan Stancek

Created: 2012-10-26 07:51:18 UTC

Size: 1.64 KB

patch

obsolete

>#include <sys/syscall.h>
>#include <sys/types.h>
>#include <sys/syscall.h>
>#include <sys/wait.h>
>#include <sys/mman.h>
>#include <errno.h>
>#include <unistd.h>
>#include <stdio.h>
>#include <numa.h>
>#include <numaif.h>
>
>#define bitsperlong (8 * sizeof(unsigned long))
>
>static int addr_on_node(void *addr)
>{
>    int node;
>    int ret;
>
>    ret = get_mempolicy(&node, NULL, 0, addr, MPOL_F_NODE | MPOL_F_ADDR);
>    if (ret == -1) {
>        printf("error getting memory policy for page %p\n", addr);
>    }
>    return node;
>}
>
>void set_bit(unsigned long *b, unsigned int n, unsigned int v)
>{
>    if (v)
>        b[n/bitsperlong] |= 1UL << (n % bitsperlong);
>    else
>        b[n/bitsperlong] &= ~(1UL << (n % bitsperlong));
>}
>
>void migrate_to_node(int node)
>{
>    long old_nodes[8];
>    long new_nodes[8];
>    long ret;
>
>    memset(old_nodes, 255, sizeof(old_nodes));
>    memset(new_nodes, 0, sizeof(new_nodes));
>    set_bit(new_nodes, node, 1);
>
>    ret = migrate_pages(0, 512, old_nodes, new_nodes);
>    if (ret != 0) {
>        printf("migrate_pages failed: %ld\n", ret);
>        exit(2);
>    }
>}
>
>int main()
>{
>    int *testp = mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE,
>            MAP_ANONYMOUS|MAP_SHARED, 0, 0);
>    if (testp == MAP_FAILED) {
>        printf("mmap failed\n");
>    }
>    testp[0] = 1;
>
>    migrate_to_node(0);
>    printf("1. shared mem is on node: %d\n", addr_on_node(testp));
>    migrate_to_node(1);
>    printf("2. shared mem is on node: %d\n", addr_on_node(testp));
>    migrate_to_node(2);
>    printf("3. shared mem is on node: %d\n", addr_on_node(testp));
>    migrate_to_node(3);
>    printf("4. shared mem is on node: %d\n", addr_on_node(testp));
>
>    return 0;
>}
>

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Attachments on bug 870326: 633710