linux-kernel - Re: [PATCH] ipc: optimize semget/shmget/msgget for lots of keys

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Message-ID: <20170807182103.GC25038@linux-80c1.suse>
Date:   Mon, 7 Aug 2017 11:21:03 -0700
From:   Davidlohr Bueso <dave@...olabs.net>
To:     Guillaume Knispel <guillaume.knispel@...ersonicimagine.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Manfred Spraul <manfred@...orfullife.com>,
        Kees Cook <keescook@...omium.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Serge Hallyn <serge@...lyn.com>,
        Andrey Vagin <avagin@...nvz.org>,
        Marc Pardo <marc.pardo@...ersonicimagine.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipc: optimize semget/shmget/msgget for lots of keys

On Mon, 31 Jul 2017, Guillaume Knispel wrote:
> struct ipc_ids {
> 	int in_use;
> 	unsigned short seq;
>+	bool tables_initialized;

So this is really ugly to have, but I understand why you added it. I
wonder what folks would think if we just panic() in the rhashtable_init()
ENOMEM case, and convert the EINVALs to WARNs. This way the function
would always be called successfully. This is similar to what futex_init
does, with the underlying hash table allocator panicing. sems and msg
would probably have to be converted to pure_initcall, but hey, we could
at least get the symmetry back.

> static int __init ipc_ns_init(void)
> {
>-	shm_init_ns(&init_ipc_ns);
>-	return 0;
>+	const int err = shm_init_ns(&init_ipc_ns);
>+	WARN(err, "ipc: sysV shm_init_ns failed: %d\n", err);

nit: s/sysV/sysv

>+	return err;
> }

Thanks,
Davidlohr