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

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Message-ID: <CAG_fn=X8SPyHWZnxzauAPY2SG-6fpCkjt-umLaDvC4wz3khLVw@mail.gmail.com>
Date:   Fri, 22 Jan 2021 09:54:50 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Vijayanand Jitta <vjitta@...eaurora.org>,
        Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        dan.j.williams@...el.com, broonie@...nel.org,
        Masami Hiramatsu <mhiramat@...nel.org>,
        LKML <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 Mon, Jan 18, 2021 at 11:54 PM Randy Dunlap <rdunlap@...radead.org> 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'
>
Hi Randy,

Could you try out the following patch?

Thanks,
Alex

diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
index 33ce59d91461..94d3f9620d0b 100644
--- a/arch/arc/kernel/vmlinux.lds.S
+++ b/arch/arc/kernel/vmlinux.lds.S
@@ -83,6 +83,8 @@ SECTIONS

        .text : {
                _text = .;
+               IRQENTRY_TEXT
+               SOFTIRQENTRY_TEXT
                TEXT_TEXT
                SCHED_TEXT
                CPUIDLE_TEXT