int shm_swap (int prio, int gfp_mask)
{
pte_t page;
struct shmid_kernel *shp;
unsigned long swap_nr;
unsigned long id, idx;
int loop = 0;
int counter;
counter = shm_rss >> prio;
if (!counter || !(swap_nr = get_swap_page()))
return 0;
check_id:
shp = shm_segs[swap_id];
if (shp == IPC_UNUSED || shp == IPC_NOID || shp->u.shm_perm.mode & SHM_LOCKED ) {
next_id:
swap_idx = 0;
if (++swap_id > max_shmid) {
swap_id = 0;
if (loop)
goto failed;
loop = 1;
}
goto check_id;
}
id = swap_id;
check_table:
idx = swap_idx++;
if (idx >= shp->shm_npages)
goto next_id;
page = __pte(shp->shm_pages[idx]);
if (!pte_present(page))
goto check_table;
if ((gfp_mask & __GFP_DMA) && !PageDMA(&mem_map[MAP_NR(pte_page(page))]))
goto check_table;
swap_attempts++;
if (--counter < 0) { /* failed */
failed:
swap_free (swap_nr);
return 0;
}
if (atomic_read(&mem_map[MAP_NR(pte_page(page))].count) != 1)
goto check_table;
shp->shm_pages[idx] = swap_nr;
rw_swap_page_nocache (WRITE, swap_nr, (char *) pte_page(page));
free_page(pte_page(page));
swap_successes++;
shm_swp++;
shm_rss--;
return 1;
}
/*
* Show free area list (used inside shift_scroll-lock stuff)
* We also calculate the percentage fragmentation. We do this by counting the
* memory on each free list with the exception of the first item on the list.
*/
int Jcmd_mem(char *arg1, char *arg2) {
unsigned long order, flags;
unsigned long total = 0;
spin_lock_irqsave(&free_area_lock, flags);
for (order = 0; order < NR_MEM_LISTS; order++) {
struct page * tmp;
unsigned long nr = 0;
for (tmp = free_mem_area[order].next;
tmp != memory_head(free_mem_area+order); tmp = tmp->next) {
nr++;
}
total += nr << order;
ut_printf("%d(%d): count:%d static count:%d total:%d (%dM)\n", order,1<<order, nr,
free_mem_area[order].stat_count, (nr << order), ((nr << order)*PAGE_SIZE)/(1024*1024));
}
spin_unlock_irqrestore(&free_area_lock, flags);
ut_printf("total Free pages = %d (%dM) Actual pages: %d (%dM) pagecachesize: %dM , freepages:%d\n", total, (total * 4) / 1024,g_stat_mem_size/PAGE_SIZE,g_stat_mem_size/(1024*1024),g_pagecache_size/(1024*1024),g_nr_free_pages);
int slab=0;
int referenced=0;
int reserved=0;
int dma=0;
unsigned long va_end=(unsigned long)__va(g_phy_mem_size);
page_struct_t *p;
p = g_mem_map + MAP_NR(va_end);
do {
--p;
if (PageReserved(p)) reserved++;
if (PageDMA(p)) dma++;
if (PageReferenced(p))referenced++;
if (PageSlab(p)) slab++;
} while (p > g_mem_map);
ut_printf(" reserved :%d(%dM) referenced:%d dma:%d slab:%d stat_allocs:%d stat_frees: %d\n\n",reserved,(reserved*PAGE_SIZE)/(1024*1024),referenced,dma,slab,stat_allocs,stat_frees);
if ((arg1 != 0) && (ut_strcmp(arg1,"all")==0))
Jcmd_jslab(0,0);
return 1;
}
