linux-kernel - Re: [PATCH v5 1/2] lib: stackdepot: Add support to configure STACK_HASH

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Date:   Tue, 19 Jan 2021 12:22:22 +0530
From:   Vijayanand Jitta <vjitta@...eaurora.org>
To:     Randy Dunlap <rdunlap@...radead.org>, minchan@...nel.org,
        glider@...gle.com, akpm@...ux-foundation.org,
        dan.j.williams@...el.com, broonie@...nel.org, mhiramat@...nel.org
Cc:     linux-kernel@...r.kernel.org, ylal@...eaurora.org,
        vinmenon@...eaurora.org, Vineet Gupta <vgupta@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH v5 1/2] lib: stackdepot: Add support to configure
 STACK_HASH_SIZE



On 1/19/2021 4:23 AM, Randy Dunlap wrote:
> On 1/18/21 1:56 AM, vjitta@...eaurora.org wrote:
>> From: Yogesh Lal <ylal@...eaurora.org>
>>
>> Use CONFIG_STACK_HASH_ORDER to configure STACK_HASH_SIZE.
>>
>> Aim is to have configurable value for  STACK_HASH_SIZE,
>> so depend on use case one can configure it.
>>
>> One example is of Page Owner, default value of
>> STACK_HASH_SIZE lead stack depot to consume 8MB of static memory.
>> Making it configurable and use lower value helps to enable features like
>> CONFIG_PAGE_OWNER without any significant overhead.
>>
>> Signed-off-by: Yogesh Lal <ylal@...eaurora.org>
>> Signed-off-by: Vinayak Menon <vinmenon@...eaurora.org>
>> Signed-off-by: Vijayanand Jitta <vjitta@...eaurora.org>
> 
> Hi,
> 
> Did you see
> https://lore.kernel.org/lkml/202101050729.cwTd47Yw-lkp@intel.com/
> 
> It seems that arch/arc/ does not have:
>    arc-elf-ld: lib/stackdepot.o: in function `filter_irq_stacks':
>    (.text+0x6): undefined reference to `__irqentry_text_start'
>>> arc-elf-ld: (.text+0x6): undefined reference to `__irqentry_text_start'
>>> arc-elf-ld: (.text+0x26): undefined reference to `__irqentry_text_end'
>>> arc-elf-ld: (.text+0x26): undefined reference to `__irqentry_text_end'
>>> arc-elf-ld: (.text+0x34): undefined reference to `__softirqentry_text_start'
>>> arc-elf-ld: (.text+0x34): undefined reference to `__softirqentry_text_start'
>>> arc-elf-ld: (.text+0x3c): undefined reference to `__softirqentry_text_end'
>>> arc-elf-ld: (.text+0x3c): undefined reference to `__softirqentry_text_end'
> 
> 
> 
> 

The above issue seems to be because of a different patch.
This one
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=505a0ef15f96c6c43ec719c9fc1833d98957bb39

I didn't really get why you referred that here.

Thanks,
Vijay
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