linux-kernel - RE: [PATCH 1/1] exception/stackdepot: add irqentry section in case of STACKDEPOT

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Date:   Mon, 06 Sep 2021 18:13:51 +0530
From:   Maninder Singh <maninder1.s@...sung.com>
To:     Maninder Singh <maninder1.s@...sung.com>,
        "linux@...linux.org.uk" <linux@...linux.org.uk>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "joey.gouly@....com" <joey.gouly@....com>,
        "maz@...nel.org" <maz@...nel.org>,
        "pcc@...gle.com" <pcc@...gle.com>,
        "amit.kachhap@....com" <amit.kachhap@....com>,
        "ryabinin.a.a@...il.com" <ryabinin.a.a@...il.com>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
        Vaneet Narang <v.narang@...sung.com>,
        AMIT SAHRAWAT <a.sahrawat@...sung.com>
Subject: RE: [PATCH 1/1] exception/stackdepot: add irqentry section in case
 of STACKDEPOT


Hi,

Any inputs on this?

>As of now if CONFIG_FUNCTION_GRAPH_TRACER is disabled some functions
>like gic_handle_irq will not be added in irqentry text section.
> 
>which leads to adding more stacks in stackdepot as frames below IRQ
>will not be filtered with filter_irq_stack() function.
> 
>checked with debug interface for satckdepot:
>https://lkml.org/lkml/2017/11/22/242
> 
>e.g. (ARM)
>stack count 23188 backtrace
> prep_new_page+0x14c/0x160
> get_page_from_freelist+0x1258/0x1350
>...
> __handle_domain_irq+0x1ac/0x4ac
> gic_handle_irq+0x44/0x80
> __irq_svc+0x5c/0x98
> __slab_alloc.constprop.0+0x84/0xac
> __kmalloc+0x31c/0x340
> sf_malloc+0x14/0x18
> 
>and for same _irq_svc there were 25000 calls which was causing
>memory pressure of 2MB more on satckdepot, which will keep increasing.
> 
>Before patch memory consumption on ARM target after 2 hours:
>Memory consumed by Stackdepot:3600 KB
> 
>After change:
>============
>Memory consumed by Stackdepot:1744 KB
> 
> prep_new_page+0x14c/0x160
> get_page_from_freelist+0x2e4/0x1350
>...
> __handle_domain_irq+0x1ac/0x4ac
> gic_handle_irq+0x44/0x80
> 
>^^^^^ no frames below this.
> 
>Signed-off-by: Maninder Singh <maninder1.s@...sung.com>
>Signed-off-by: Vaneet Narang <v.narang@...sung.com>
>---
> arch/arm/include/asm/exception.h   | 2 +-
> arch/arm64/include/asm/exception.h | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
> 
>diff --git a/arch/arm/include/asm/exception.h b/arch/arm/include/asm/exception.h
>index 58e039a851af..3f4534cccc0f 100644
>--- a/arch/arm/include/asm/exception.h
>+++ b/arch/arm/include/asm/exception.h
>@@ -10,7 +10,7 @@
> 
> #include <linux/interrupt.h>
> 
>-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
>+#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_STACKDEPOT)
> #define __exception_irq_entry        __irq_entry
> #else
> #define __exception_irq_entry
>diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h
>index 339477dca551..ef2581b63405 100644
>--- a/arch/arm64/include/asm/exception.h
>+++ b/arch/arm64/include/asm/exception.h
>@@ -13,7 +13,7 @@
> 
> #include <linux/interrupt.h>
> 
>-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
>+#if defined(CONFIG_FUNCTION_GRAPH_TRACER) || defined(CONFIG_STACKDEPOT)
> #define __exception_irq_entry        __irq_entry
> #else
> #define __exception_irq_entry        __kprobes
>--