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Date: Thu, 31 Jan 2002 16:01:59 -0800 (PST)
Message-Id: <20020131.160159.41632715.davem@redhat.com>
To: andrea@suse.de
Cc: anton@samba.org, mingo@elte.hu, torvalds@transmeta.com,
        riel@conectiva.com.br, velco@fadata.bg, stoffel@casc.com,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Radix-tree pagecache for 2.5
From: "David S. Miller" <davem@redhat.com>
In-Reply-To: <20020201005543.K3396@athlon.random>
In-Reply-To: <Pine.LNX.4.33.0201312227350.18203-100000@localhost.localdomain>
	<20020131231242.GA4138@krispykreme>
	<20020201005543.K3396@athlon.random>
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   From: Andrea Arcangeli <andrea@suse.de>
   Date: Fri, 1 Feb 2002 00:55:43 +0100
   
   In short, for an optimal comparison between hash and radix tree, we'd
   need to fixup the hash allocation with the bootmem allocator first.

I'm totally convinced the radix stuff is much better, but since you
are not here is the "pagecache hash in bootmem" patch I did ages ago
so Anton can make you happy :-)

diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/alpha/mm/init.c linux/arch/alpha/mm/init.c
--- vanilla/linux/arch/alpha/mm/init.c	Thu Sep 20 20:02:03 2001
+++ linux/arch/alpha/mm/init.c	Sat Nov 10 01:49:56 2001
@@ -23,6 +23,7 @@
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif
+#include <linux/pagemap.h>
 
 #include <asm/system.h>
 #include <asm/uaccess.h>
@@ -360,6 +361,7 @@
 mem_init(void)
 {
 	max_mapnr = num_physpages = max_low_pfn;
+	page_cache_init(count_free_bootmem());
 	totalram_pages += free_all_bootmem();
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/alpha/mm/numa.c linux/arch/alpha/mm/numa.c
--- vanilla/linux/arch/alpha/mm/numa.c	Sun Aug 12 10:38:48 2001
+++ linux/arch/alpha/mm/numa.c	Sat Nov 10 01:52:27 2001
@@ -15,6 +15,7 @@
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif
+#include <linux/pagemap.h>
 
 #include <asm/hwrpb.h>
 #include <asm/pgalloc.h>
@@ -359,8 +360,13 @@
 	extern char _text, _etext, _data, _edata;
 	extern char __init_begin, __init_end;
 	extern unsigned long totalram_pages;
-	unsigned long nid, i;
+	unsigned long nid, i, num_free_bootmem_pages;
 	mem_map_t * lmem_map;
+
+	num_free_bootmem_pages = 0;
+	for (nid = 0; nid < numnodes; nid++)
+		num_free_bootmem_pages += count_free_bootmem_node(NODE_DATA(nid));
+	page_cache_init(num_free_bootmem_pages);
 
 	high_memory = (void *) __va(max_mapnr <<PAGE_SHIFT);
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/arm/mm/init.c linux/arch/arm/mm/init.c
--- vanilla/linux/arch/arm/mm/init.c	Thu Oct 11 09:04:57 2001
+++ linux/arch/arm/mm/init.c	Sat Nov 10 01:52:34 2001
@@ -23,6 +23,7 @@
 #include <linux/init.h>
 #include <linux/bootmem.h>
 #include <linux/blk.h>
+#include <linux/pagemap.h>
 
 #include <asm/segment.h>
 #include <asm/mach-types.h>
@@ -594,6 +595,7 @@
 void __init mem_init(void)
 {
 	unsigned int codepages, datapages, initpages;
+	unsigned long num_free_bootmem_pages;
 	int i, node;
 
 	codepages = &_etext - &_text;
@@ -608,6 +610,11 @@
 	 */
 	if (meminfo.nr_banks != 1)
 		create_memmap_holes(&meminfo);
+
+	num_free_bootmem_pages = 0;
+	for (node = 0; node < numnodes; node++)
+		num_free_bootmem_pages += count_free_bootmem_node(NODE_DATA(node));
+	page_cache_init(num_free_bootmem_pages);
 
 	/* this will put all unused low memory onto the freelists */
 	for (node = 0; node < numnodes; node++) {
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/cris/mm/init.c linux/arch/cris/mm/init.c
--- vanilla/linux/arch/cris/mm/init.c	Thu Jul 26 15:10:06 2001
+++ linux/arch/cris/mm/init.c	Sat Nov 10 01:53:10 2001
@@ -95,6 +95,7 @@
 #include <linux/swap.h>
 #include <linux/smp.h>
 #include <linux/bootmem.h>
+#include <linux/pagemap.h>
 
 #include <asm/system.h>
 #include <asm/segment.h>
@@ -366,6 +367,8 @@
 
 	max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
  
+	page_cache_init(count_free_bootmem());
+
 	/* this will put all memory onto the freelists */
         totalram_pages = free_all_bootmem();
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/i386/mm/init.c linux/arch/i386/mm/init.c
--- vanilla/linux/arch/i386/mm/init.c	Sun Nov 18 19:59:22 2001
+++ linux/arch/i386/mm/init.c	Mon Nov 12 00:14:00 2001
@@ -466,6 +466,8 @@
 #endif
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 
+	page_cache_init(count_free_bootmem());
+
 	/* clear the zero-page */
 	memset(empty_zero_page, 0, PAGE_SIZE);
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/ia64/mm/init.c linux/arch/ia64/mm/init.c
--- vanilla/linux/arch/ia64/mm/init.c	Sun Nov 18 19:59:23 2001
+++ linux/arch/ia64/mm/init.c	Sat Nov 10 01:54:20 2001
@@ -13,6 +13,7 @@
 #include <linux/reboot.h>
 #include <linux/slab.h>
 #include <linux/swap.h>
+#include <linux/pagemap.h>
 
 #include <asm/bitops.h>
 #include <asm/dma.h>
@@ -406,6 +407,8 @@
 
 	max_mapnr = max_low_pfn;
 	high_memory = __va(max_low_pfn * PAGE_SIZE);
+
+	page_cache_init(count_free_bootmem());
 
 	totalram_pages += free_all_bootmem();
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/m68k/mm/init.c linux/arch/m68k/mm/init.c
--- vanilla/linux/arch/m68k/mm/init.c	Thu Sep 20 20:02:03 2001
+++ linux/arch/m68k/mm/init.c	Sat Nov 10 01:54:47 2001
@@ -20,6 +20,7 @@
 #ifdef CONFIG_BLK_DEV_RAM
 #include <linux/blk.h>
 #endif
+#include <linux/pagemap.h>
 
 #include <asm/setup.h>
 #include <asm/uaccess.h>
@@ -135,6 +136,8 @@
 	if (MACH_IS_ATARI)
 		atari_stram_mem_init_hook();
 #endif
+
+	page_cache_init(count_free_bootmem());
 
 	/* this will put all memory onto the freelists */
 	totalram_pages = free_all_bootmem();
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/mips/mm/init.c linux/arch/mips/mm/init.c
--- vanilla/linux/arch/mips/mm/init.c	Wed Jul  4 11:50:39 2001
+++ linux/arch/mips/mm/init.c	Sat Nov 10 01:55:09 2001
@@ -28,6 +28,7 @@
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif
+#include <linux/pagemap.h>
 
 #include <asm/bootinfo.h>
 #include <asm/cachectl.h>
@@ -203,6 +204,8 @@
 
 	max_mapnr = num_physpages = max_low_pfn;
 	high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
+
+	page_cache_init(count_free_bootmem());
 
 	totalram_pages += free_all_bootmem();
 	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages.  */
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/mips64/mm/init.c linux/arch/mips64/mm/init.c
--- vanilla/linux/arch/mips64/mm/init.c	Wed Jul  4 11:50:39 2001
+++ linux/arch/mips64/mm/init.c	Sat Nov 10 01:55:30 2001
@@ -25,6 +25,7 @@
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>
 #endif
+#include <linux/pagemap.h>
 
 #include <asm/bootinfo.h>
 #include <asm/cachectl.h>
@@ -396,6 +397,8 @@
 
 	max_mapnr = num_physpages = max_low_pfn;
 	high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
+
+	page_cache_init(count_free_bootmem());
 
 	totalram_pages += free_all_bootmem();
 	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages.  */
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/mips64/sgi-ip27/ip27-memory.c linux/arch/mips64/sgi-ip27/ip27-memory.c
--- vanilla/linux/arch/mips64/sgi-ip27/ip27-memory.c	Sun Sep  9 10:43:02 2001
+++ linux/arch/mips64/sgi-ip27/ip27-memory.c	Sat Nov 10 02:02:33 2001
@@ -15,6 +15,7 @@
 #include <linux/mm.h>
 #include <linux/bootmem.h>
 #include <linux/swap.h>
+#include <linux/pagemap.h>
 
 #include <asm/page.h>
 #include <asm/bootinfo.h>
@@ -277,6 +278,11 @@
 	num_physpages = numpages;	/* memory already sized by szmem */
 	max_mapnr = pagenr;		/* already found during paging_init */
 	high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
+
+	tmp = 0;
+	for (nid = 0; nid < numnodes; nid++)
+		tmp += count_free_bootmem_node(NODE_DATA(nid));
+	page_cache_init(tmp);
 
 	for (nid = 0; nid < numnodes; nid++) {
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/parisc/mm/init.c linux/arch/parisc/mm/init.c
--- vanilla/linux/arch/parisc/mm/init.c	Tue Dec  5 12:29:39 2000
+++ linux/arch/parisc/mm/init.c	Sat Nov 10 01:57:11 2001
@@ -17,6 +17,7 @@
 #include <linux/pci.h>		/* for hppa_dma_ops and pcxl_dma_ops */
 #include <linux/swap.h>
 #include <linux/unistd.h>
+#include <linux/pagemap.h>
 
 #include <asm/pgalloc.h>
 
@@ -48,6 +49,8 @@
 {
 	max_mapnr = num_physpages = max_low_pfn;
 	high_memory = __va(max_low_pfn * PAGE_SIZE);
+
+	page_cache_init(count_free_bootmem());
 
 	totalram_pages += free_all_bootmem();
 	printk("Memory: %luk available\n", totalram_pages << (PAGE_SHIFT-10));
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/ppc/mm/init.c linux/arch/ppc/mm/init.c
--- vanilla/linux/arch/ppc/mm/init.c	Tue Oct  2 09:12:44 2001
+++ linux/arch/ppc/mm/init.c	Sat Nov 10 01:57:34 2001
@@ -34,6 +34,7 @@
 #ifdef CONFIG_BLK_DEV_INITRD
 #include <linux/blk.h>		/* for initrd_* */
 #endif
+#include <linux/pagemap.h>
 
 #include <asm/pgalloc.h>
 #include <asm/prom.h>
@@ -462,6 +463,8 @@
 
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 	num_physpages = max_mapnr;	/* RAM is assumed contiguous */
+
+	page_cache_init(count_free_bootmem());
 
 	totalram_pages += free_all_bootmem();
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/s390/mm/init.c linux/arch/s390/mm/init.c
--- vanilla/linux/arch/s390/mm/init.c	Thu Oct 11 09:04:57 2001
+++ linux/arch/s390/mm/init.c	Sat Nov 10 01:57:56 2001
@@ -186,6 +186,8 @@
         /* clear the zero-page */
         memset(empty_zero_page, 0, PAGE_SIZE);
 
+	page_cache_init(count_free_bootmem());
+
 	/* this will put all low memory onto the freelists */
 	totalram_pages += free_all_bootmem();
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/s390x/mm/init.c linux/arch/s390x/mm/init.c
--- vanilla/linux/arch/s390x/mm/init.c	Sun Nov 18 19:59:23 2001
+++ linux/arch/s390x/mm/init.c	Sat Nov 10 01:58:14 2001
@@ -198,6 +198,8 @@
         /* clear the zero-page */
         memset(empty_zero_page, 0, PAGE_SIZE);
 
+        page_cache_init(count_free_bootmem());
+
 	/* this will put all low memory onto the freelists */
 	totalram_pages += free_all_bootmem();
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/sh/mm/init.c linux/arch/sh/mm/init.c
--- vanilla/linux/arch/sh/mm/init.c	Mon Oct 15 13:36:48 2001
+++ linux/arch/sh/mm/init.c	Sat Nov 10 01:59:56 2001
@@ -26,6 +26,7 @@
 #endif
 #include <linux/highmem.h>
 #include <linux/bootmem.h>
+#include <linux/pagemap.h>
 
 #include <asm/processor.h>
 #include <asm/system.h>
@@ -139,6 +140,7 @@
 void __init mem_init(void)
 {
 	extern unsigned long empty_zero_page[1024];
+	unsigned long num_free_bootmem_pages;
 	int codesize, reservedpages, datasize, initsize;
 	int tmp;
 
@@ -148,6 +150,12 @@
 	/* clear the zero-page */
 	memset(empty_zero_page, 0, PAGE_SIZE);
 	__flush_wback_region(empty_zero_page, PAGE_SIZE);
+
+	num_free_bootmem_pages = count_free_bootmem_node(NODE_DATA(0));
+#ifdef CONFIG_DISCONTIGMEM
+	num_free_bootmem_pages += count_free_bootmem_node(NODE_DATA(1));
+#endif
+	page_cache_init(num_free_bootmem_pages);
 
 	/* this will put all low memory onto the freelists */
 	totalram_pages += free_all_bootmem_node(NODE_DATA(0));
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/sparc/mm/init.c linux/arch/sparc/mm/init.c
--- vanilla/linux/arch/sparc/mm/init.c	Mon Oct  1 09:19:56 2001
+++ linux/arch/sparc/mm/init.c	Mon Nov 12 19:27:47 2001
@@ -25,6 +25,7 @@
 #include <linux/init.h>
 #include <linux/highmem.h>
 #include <linux/bootmem.h>
+#include <linux/pagemap.h>
 
 #include <asm/system.h>
 #include <asm/segment.h>
@@ -434,6 +432,8 @@
 
 	max_mapnr = last_valid_pfn - (phys_base >> PAGE_SHIFT);
 	high_memory = __va(max_low_pfn << PAGE_SHIFT);
+
+	page_cache_init(count_free_bootmem());
 
 #ifdef DEBUG_BOOTMEM
 	prom_printf("mem_init: Calling free_all_bootmem().\n");
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/arch/sparc64/mm/init.c linux/arch/sparc64/mm/init.c
--- vanilla/linux/arch/sparc64/mm/init.c	Sun Nov 18 19:59:23 2001
+++ linux/arch/sparc64/mm/init.c	Sat Nov 17 23:51:28 2001
@@ -1583,6 +1583,8 @@
 
 	max_mapnr = last_valid_pfn - (phys_base >> PAGE_SHIFT);
 	high_memory = __va(last_valid_pfn << PAGE_SHIFT);
+
+	page_cache_init(count_free_bootmem());
 
 	num_physpages = free_all_bootmem() - 1;
 
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/include/linux/bootmem.h linux/include/linux/bootmem.h
--- vanilla/linux/include/linux/bootmem.h	Mon Nov  5 12:43:18 2001
+++ linux/include/linux/bootmem.h	Mon Nov 19 10:22:17 2001
@@ -43,11 +43,13 @@
 #define alloc_bootmem_low_pages(x) \
 	__alloc_bootmem((x), PAGE_SIZE, 0)
 extern unsigned long __init free_all_bootmem (void);
+extern unsigned long __init count_free_bootmem (void);
 
 extern unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long freepfn, unsigned long startpfn, unsigned long endpfn);
 extern void __init reserve_bootmem_node (pg_data_t *pgdat, unsigned long physaddr, unsigned long size);
 extern void __init free_bootmem_node (pg_data_t *pgdat, unsigned long addr, unsigned long size);
 extern unsigned long __init free_all_bootmem_node (pg_data_t *pgdat);
+extern unsigned long __init count_free_bootmem_node (pg_data_t *pgdat);
 extern void * __init __alloc_bootmem_node (pg_data_t *pgdat, unsigned long size, unsigned long align, unsigned long goal);
 #define alloc_bootmem_node(pgdat, x) \
 	__alloc_bootmem_node((pgdat), (x), SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/init/main.c linux/init/main.c
--- vanilla/linux/init/main.c	Sun Nov 18 19:59:37 2001
+++ linux/init/main.c	Sat Nov 10 04:58:16 2001
@@ -597,7 +597,6 @@
 	proc_caches_init();
 	vfs_caches_init(mempages);
 	buffer_init(mempages);
-	page_cache_init(mempages);
 #if defined(CONFIG_ARCH_S390)
 	ccwcache_init();
 #endif
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/mm/bootmem.c linux/mm/bootmem.c
--- vanilla/linux/mm/bootmem.c	Tue Sep 18 14:10:43 2001
+++ linux/mm/bootmem.c	Mon Nov 12 20:40:58 2001
@@ -272,6 +279,28 @@
 	return total;
 }
 
+static unsigned long __init count_free_bootmem_core(pg_data_t *pgdat)
+{
+	bootmem_data_t *bdata = pgdat->bdata;
+	unsigned long i, idx, total;
+
+	if (!bdata->node_bootmem_map) BUG();
+
+	total = 0;
+	idx = bdata->node_low_pfn - (bdata->node_boot_start >> PAGE_SHIFT);
+	for (i = 0; i < idx; i++) {
+		if (!test_bit(i, bdata->node_bootmem_map))
+			total++;
+	}
+
+	/*
+	 * Count the allocator bitmap itself.
+	 */
+	total += ((bdata->node_low_pfn-(bdata->node_boot_start >> PAGE_SHIFT))/8 + PAGE_SIZE-1)/PAGE_SIZE;
+
+	return total;
+}
+
 unsigned long __init init_bootmem_node (pg_data_t *pgdat, unsigned long freepfn, unsigned long startpfn, unsigned long endpfn)
 {
 	return(init_bootmem_core(pgdat, freepfn, startpfn, endpfn));
@@ -292,6 +321,11 @@
 	return(free_all_bootmem_core(pgdat));
 }
 
+unsigned long __init count_free_bootmem_node (pg_data_t *pgdat)
+{
+	return(count_free_bootmem_core(pgdat));
+}
+
 unsigned long __init init_bootmem (unsigned long start, unsigned long pages)
 {
 	max_low_pfn = pages;
@@ -312,6 +346,11 @@
 unsigned long __init free_all_bootmem (void)
 {
 	return(free_all_bootmem_core(&contig_page_data));
+}
+
+unsigned long __init count_free_bootmem (void)
+{
+	return(count_free_bootmem_core(&contig_page_data));
 }
 
 void * __init __alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal)
diff -u --recursive --new-file --exclude=CVS --exclude=.cvsignore vanilla/linux/mm/filemap.c linux/mm/filemap.c
--- vanilla/linux/mm/filemap.c	Sun Nov 18 19:59:38 2001
+++ linux/mm/filemap.c	Fri Nov 16 07:31:35 2001
@@ -24,6 +24,7 @@
 #include <linux/mm.h>
 #include <linux/iobuf.h>
 #include <linux/compiler.h>
+#include <linux/bootmem.h>
 
 #include <asm/pgalloc.h>
 #include <asm/uaccess.h>
@@ -2931,28 +2932,48 @@
 	goto unlock;
 }
 
+/* This is called from the arch specific mem_init routine.
+ * It is done right before free_all_bootmem (or NUMA equivalent).
+ *
+ * The mempages arg is the number of pages free_all_bootmem is
+ * going to liberate, or a close approximation.
+ *
+ * We have to use bootmem because on huge systems (ie. 16GB ram)
+ * get_free_pages cannot give us a large enough allocation.
+ */
 void __init page_cache_init(unsigned long mempages)
 {
-	unsigned long htable_size, order;
+	unsigned long htable_size, real_size;
 
 	htable_size = mempages;
 	htable_size *= sizeof(struct page *);
-	for(order = 0; (PAGE_SIZE << order) < htable_size; order++)
+
+	for (real_size = 1UL; real_size < htable_size; real_size <<= 1UL)
 		;
 
 	do {
-		unsigned long tmp = (PAGE_SIZE << order) / sizeof(struct page *);
+		unsigned long tmp = (real_size / sizeof(struct page *));
+		unsigned long align;
 
 		page_hash_bits = 0;
 		while((tmp >>= 1UL) != 0UL)
 			page_hash_bits++;
+		
+		align = real_size;
+		if (align > (4UL * 1024UL * 1024UL))
+			align = (4UL * 1024UL * 1024UL);
+
+		page_hash_table = __alloc_bootmem(real_size, align,
+						  __pa(MAX_DMA_ADDRESS));
+
+		/* Perhaps the alignment was too strict. */
+		if (page_hash_table == NULL)
+			page_hash_table = alloc_bootmem(real_size);
+	} while (page_hash_table == NULL &&
+		 (real_size >>= 1UL) >= PAGE_SIZE);
 
-		page_hash_table = (struct page **)
-			__get_free_pages(GFP_ATOMIC, order);
-	} while(page_hash_table == NULL && --order > 0);
-
-	printk("Page-cache hash table entries: %d (order: %ld, %ld bytes)\n",
-	       (1 << page_hash_bits), order, (PAGE_SIZE << order));
+	printk("Page-cache hash table entries: %d (%ld bytes)\n",
+	       (1 << page_hash_bits), real_size);
 	if (!page_hash_table)
 		panic("Failed to allocate page hash table\n");
 	memset((void *)page_hash_table, 0, PAGE_HASH_SIZE * sizeof(struct page *));
-
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