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Commit 938179b4 authored by Dimitri Sivanich's avatar Dimitri Sivanich Committed by Ingo Molnar
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x86: Improve Intel microcode loader performance 



We've noticed that on large SGI UV system configurations,
running microcode.ctl can take very long periods of time.  This
is due to the large number of vmalloc/vfree calls made by the
Intel generic_load_microcode() logic.

By reusing allocated space, the following patch reduces the time
to run microcode.ctl on a 1024 cpu system from approximately 80
seconds down to 1 or 2 seconds.

Signed-off-by: default avatarDimitri Sivanich <sivanich@sgi.com>
Acked-by: default avatarDmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: Avi Kivity <avi@redhat.com>
Cc: Bill Davidsen <davidsen@tmr.com>
LKML-Reference: <20100305174203.GA19638@sgi.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 522dba71

arch/x86/kernel/microcode_intel.c

+16 −6
Original line number Diff line number Diff line
@@ -343,10 +343,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size, 
				int (*get_ucode_data)(void *, const void *, size_t))

{

	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;

	u8 *ucode_ptr = data, *new_mc = NULL, *mc;

	u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL;

	int new_rev = uci->cpu_sig.rev;

	unsigned int leftover = size;

	enum ucode_state state = UCODE_OK;

	unsigned int curr_mc_size = 0;



	while (leftover) {

		struct microcode_header_intel mc_header;
@@ -361,9 +362,15 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size, 
			break;

		}



		/* For performance reasons, reuse mc area when possible */

		if (!mc || mc_size > curr_mc_size) {

			if (mc)

				vfree(mc);

			mc = vmalloc(mc_size);

			if (!mc)

				break;

			curr_mc_size = mc_size;

		}



		if (get_ucode_data(mc, ucode_ptr, mc_size) ||

		    microcode_sanity_check(mc) < 0) {
@@ -376,13 +383,16 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size, 
				vfree(new_mc);

			new_rev = mc_header.rev;

			new_mc  = mc;

		} else

			vfree(mc);

			mc = NULL;	/* trigger new vmalloc */

		}



		ucode_ptr += mc_size;

		leftover  -= mc_size;

	}



	if (mc)

		vfree(mc);



	if (leftover) {

		if (new_mc)

			vfree(new_mc);