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Date: Thu, 11 Jun 2009 16:14:29 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Ingo Molnar <mingo@...e.hu>
CC: Pekka J Enberg <penberg@...helsinki.fi>,
Christoph Lameter <cl@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
hannes@...xchg.org, mpm@...enic.com, npiggin@...e.de
Subject: Re: [GIT PULL v3] Early boot SLAB for 2.6.31
Ingo Molnar wrote:
> * Pekka J Enberg <penberg@...helsinki.fi> wrote:
>
>> Hi Linus,
>>
>> Here's third take on the early boot SLAB patches for 2.6.31. I
>> fixed the problems found by Ingo in his testing and rebased the
>> series to be bisectable. I have tested the tree on 32-bit UMA and
>> on x86-64 with qemu and Yanghai has tested them on NUMA+SLUB
>> (thanks Yanghai!). Note: The series has not been tested on non-x86
>> architectures so we may introduce some breakage there.
>
> Latest -git now produces this boot warning on x86:
>
> [ 0.000000] Memory: 885032k/915540k available (5993k kernel code, 29844k reserved, 3842k data, 428k init, 0k highmem)
> [ 0.000000] virtual kernel memory layout:
> [ 0.000000] fixmap : 0xffe17000 - 0xfffff000 (1952 kB)
> [ 0.000000] vmalloc : 0xf8615000 - 0xffe15000 ( 120 MB)
> [ 0.000000] lowmem : 0xc0000000 - 0xf7e15000 ( 894 MB)
> [ 0.000000] .init : 0xc19a5000 - 0xc1a10000 ( 428 kB)
> [ 0.000000] .data : 0xc15da4bb - 0xc199af6c (3842 kB)
> [ 0.000000] .text : 0xc1000000 - 0xc15da4bb (5993 kB)
> [ 0.000000] Checking if this processor honours the WP bit even in supervisor mode...Ok.
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at kernel/smp.c:369 smp_call_function_many+0x50/0x1b0()
> [ 0.000000] Hardware name: System Product Name
> [ 0.000000] Modules linked in:
> [ 0.000000] Pid: 0, comm: swapper Not tainted 2.6.30-tip #52504
> [ 0.000000] Call Trace:
> [ 0.000000] [<c104aa16>] warn_slowpath_common+0x65/0x95
> [ 0.000000] [<c104aa58>] warn_slowpath_null+0x12/0x15
> [ 0.000000] [<c1073bbe>] smp_call_function_many+0x50/0x1b0
> [ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
> [ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
> [ 0.000000] [<c1073d4f>] smp_call_function+0x31/0x58
> [ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
> [ 0.000000] [<c104f635>] on_each_cpu+0x26/0x65
> [ 0.000000] [<c10374b5>] flush_tlb_all+0x19/0x1b
> [ 0.000000] [<c1032ab3>] zap_low_mappings+0x4d/0x56
> [ 0.000000] [<c15d64b5>] ? printk+0x14/0x17
> [ 0.000000] [<c19b42a8>] mem_init+0x23d/0x245
> [ 0.000000] [<c19a56a1>] start_kernel+0x17a/0x2d5
> [ 0.000000] [<c19a5347>] ? unknown_bootoption+0x0/0x19a
> [ 0.000000] [<c19a5039>] __init_begin+0x39/0x41
> [ 0.000000] ---[ end trace 4eaa2a86a8e2da22 ]---
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: at kernel/lockdep.c:2128 trace_hardirqs_on_caller+0xc6/0x143()
> [ 0.000000] Hardware name: System Product Name
> [ 0.000000] Modules linked in:
> [ 0.000000] Pid: 0, comm: swapper Tainted: G W 2.6.30-tip #52504
> [ 0.000000] Call Trace:
> [ 0.000000] [<c104aa16>] warn_slowpath_common+0x65/0x95
> [ 0.000000] [<c104f64b>] ? on_each_cpu+0x3c/0x65
> [ 0.000000] [<c1037615>] ? do_flush_tlb_all+0x0/0x41
> [ 0.000000] [<c104aa58>] warn_slowpath_null+0x12/0x15
> [ 0.000000] [<c106c883>] trace_hardirqs_on_caller+0xc6/0x143
> [ 0.000000] [<c106c90b>] trace_hardirqs_on+0xb/0xd
> [ 0.000000] [<c104f64b>] on_each_cpu+0x3c/0x65
> [ 0.000000] [<c10374b5>] flush_tlb_all+0x19/0x1b
> [ 0.000000] [<c1032ab3>] zap_low_mappings+0x4d/0x56
> [ 0.000000] [<c15d64b5>] ? printk+0x14/0x17
> [ 0.000000] [<c19b42a8>] mem_init+0x23d/0x245
> [ 0.000000] [<c19a56a1>] start_kernel+0x17a/0x2d5
> [ 0.000000] [<c19a5347>] ? unknown_bootoption+0x0/0x19a
> [ 0.000000] [<c19a5039>] __init_begin+0x39/0x41
> [ 0.000000] ---[ end trace 4eaa2a86a8e2da23 ]---
> [ 0.000000] SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
> [ 0.000000] start_kernel(): bug: interrupts were enabled *very* early, fixing it
> [ 0.000000] Preemptible RCU implementation.
> [ 0.000000] NR_IRQS:2304 nr_irqs:424
> [ 0.000000] Fast TSC calibration using PIT
> [ 0.000000] Detected 2010.509 MHz processor.
> [ 0.010000] spurious 8259A interrupt: IRQ7.
> [ 0.010000] Console: colour VGA+ 80x25
> [ 0.010000] console [tty0] enabled
>
> config attached.
please check
[PATCH] x86: make zap_low_mapping could be used early
only one cpu is there, just call __flush_tlb for it
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
arch/x86/include/asm/tlbflush.h | 2 +-
arch/x86/kernel/smpboot.c | 2 +-
arch/x86/mm/init_32.c | 10 +++++++---
3 files changed, 9 insertions(+), 5 deletions(-)
Index: linux-2.6/arch/x86/include/asm/tlbflush.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/tlbflush.h
+++ linux-2.6/arch/x86/include/asm/tlbflush.h
@@ -172,6 +172,6 @@ static inline void flush_tlb_kernel_rang
flush_tlb_all();
}
-extern void zap_low_mappings(void);
+extern void zap_low_mappings(bool early);
#endif /* _ASM_X86_TLBFLUSH_H */
Index: linux-2.6/arch/x86/kernel/smpboot.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/smpboot.c
+++ linux-2.6/arch/x86/kernel/smpboot.c
@@ -875,7 +875,7 @@ int __cpuinit native_cpu_up(unsigned int
err = do_boot_cpu(apicid, cpu);
- zap_low_mappings();
+ zap_low_mappings(false);
low_mappings = 0;
#else
err = do_boot_cpu(apicid, cpu);
Index: linux-2.6/arch/x86/mm/init_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/init_32.c
+++ linux-2.6/arch/x86/mm/init_32.c
@@ -576,7 +576,7 @@ static inline void save_pg_dir(void)
}
#endif /* !CONFIG_ACPI_SLEEP */
-void zap_low_mappings(void)
+void zap_low_mappings(bool early)
{
int i;
@@ -593,7 +593,11 @@ void zap_low_mappings(void)
set_pgd(swapper_pg_dir+i, __pgd(0));
#endif
}
- flush_tlb_all();
+
+ if (early)
+ __flush_tlb();
+ else
+ flush_tlb_all();
}
pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
@@ -968,7 +972,7 @@ void __init mem_init(void)
test_wp_bit();
save_pg_dir();
- zap_low_mappings();
+ zap_low_mappings(true);
}
#ifdef CONFIG_MEMORY_HOTPLUG
--
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