linux-kernel - Re: [RFD] posix-timers: CRIU woes

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Message-ID: <20230511075632.GR4253@hirez.programming.kicks-ass.net>
Date:   Thu, 11 May 2023 09:56:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Pavel Tikhomirov <ptikhomirov@...tuozzo.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Frederic Weisbecker <frederic@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        syzbot+5c54bd3eb218bb595aa9@...kaller.appspotmail.com,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Andrei Vagin <avagin@...nvz.org>,
        Christian Brauner <brauner@...nel.org>,
        Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
        Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [RFD] posix-timers: CRIU woes

On Thu, May 11, 2023 at 12:12:32PM +0800, Pavel Tikhomirov wrote:
> Not sure how kernel memory consumption increases with sparse timer IDs,
> global hashtable (posix_timers_hashtable) is the same size anyway, entries
> in hlists can be distributed differently as hash depends on id directly but
> we have same number of entries. Probably I miss something, why do we need
> dense IDs?

The proposal was to remove the global hash and use a signal_struct based
xarray instead.