[PATCH 3/3] x86: OLPC: speed up device tree creation during boot (v2)

[Andres Salomon <dilinger-pFFUokh25LWsTnJN9+BGXg@public.gmane.org>]

Calling alloc_bootmem() for tiny chunks of memory over and over is really
slow; on an XO-1, it caused the time between when the kernel started
booting and when the display came alive (post-lxfb probe) to increase
to 44s.  This patch optimizes the prom_early_alloc function by
calling alloc_bootmem for 4k-sized blocks of memory, and handing out
chunks of that to callers.  With this patch, the time between kernel load
and display initialization decreased to 23s.  If there's a better way to
do this early in the boot process, please let me know.

(Note: increasing the chunk size to 16k didn't noticably affect boot time,
and wasted 9k.)

v2: reorder function as suggested by Grant.

Signed-off-by: Andres Salomon <dilinger-pFFUokh25LWsTnJN9+BGXg@public.gmane.org>
---
 arch/x86/platform/olpc/olpc_dt.c |   27 ++++++++++++++++++++++-----
 1 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
index b8c8ff9..0ab824d 100644
--- a/arch/x86/platform/olpc/olpc_dt.c
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -126,14 +126,31 @@ static unsigned int prom_early_allocated __initdata;
 
 void * __init prom_early_alloc(unsigned long size)
 {
+	static u8 *mem = NULL;
+	static size_t free_mem = 0;
 	void *res;
 
-	res = alloc_bootmem(size);
-	if (res)
-		memset(res, 0, size);
-
-	prom_early_allocated += size;
+	if (free_mem < size) {
+		const size_t chunk_size = max(PAGE_SIZE, size);
+
+		/*
+		 * To mimimize the number of allocations, grab at least 4k of
+		 * memory (that's an arbitrary choice that matches PAGE_SIZE on
+		 * the platforms we care about, and minimizes wasted bootmem)
+		 * and hand off chunks of it to callers.
+		 */
+		res = mem = alloc_bootmem(chunk_size);
+		if (!res)
+			return NULL;
+		prom_early_allocated += chunk_size;
+		memset(res, 0, chunk_size);
+		free_mem = chunk_size;
+	}
 
+	/* allocate from the local cache */
+	free_mem -= size;
+	res = mem;
+	mem += size;
 	return res;
 }
 
-- 
1.7.2.3