From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: mikey@neuling.org, stewart@linux.vnet.ibm.com,
apopple@au1.ibm.com, hbabu@us.ibm.com, oohall@gmail.com,
linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 14/17] powerpc: Add support for setting SPRN_TIDR
Date: Tue, 15 Aug 2017 08:25:03 +1000 [thread overview]
Message-ID: <1502749503.4493.34.camel@kernel.crashing.org> (raw)
In-Reply-To: <20170814200309.GD24096@us.ibm.com>
On Mon, 2017-08-14 at 13:03 -0700, Sukadev Bhattiprolu wrote:
> As Ben pointed out, we are going to be have limit the number of TIDs (to
> be within the size limits), so we won't be able to use task_pid_nr()? But
> if we assign the TIDs in the RX_WIN_OPEN ioctl, then only the FTW processes
> will need the TIDR value.
But you'll have to assign it for all present and future threads of that
process which is somewhat hard to do without races.
> Can we then assign new, globally-unique TID values for now and have the ioctl
> fail with -EAGAIN if all TIDs are in use? We can extend to per-process TID
> values, later?
Why would you want to do that ?
Ben.
next prev parent reply other threads:[~2017-08-14 22:25 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-08 23:06 [PATCH v6 00/17] powerpc/vas: Enable VAS Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 01/17] powerpc/vas: Define macros, register fields and structures Sukadev Bhattiprolu
2017-08-14 5:21 ` Michael Ellerman
2017-08-14 6:05 ` Nicholas Piggin
2017-08-14 11:00 ` Michael Ellerman
2017-08-14 19:14 ` Sukadev Bhattiprolu
2017-08-16 12:07 ` Michael Ellerman
2017-08-16 23:07 ` Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 02/17] powerpc/vas: Move GET_FIELD/SET_FIELD to vas.h Sukadev Bhattiprolu
2017-08-14 7:26 ` Michael Ellerman
2017-08-08 23:06 ` [PATCH v6 03/17] powerpc/vas: Define vas_init() and vas_exit() Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 04/17] powerpc/vas: Define helpers to access MMIO regions Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 05/17] powerpc/vas: Define helpers to init window context Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 06/17] powerpc/vas: Define helpers to alloc/free windows Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 07/17] powerpc/vas: Define vas_win_paste_addr() Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 08/17] powerpc/vas: Define vas_win_id() Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 09/17] powerpc/vas: Define vas_rx_win_open() interface Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 10/17] " Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 11/17] powerpc/vas: Define vas_win_close() interface Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 12/17] powerpc/vas: Define vas_tx_win_open() Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 13/17] powerpc/vas: Define copy/paste interfaces Sukadev Bhattiprolu
2017-08-08 23:06 ` [PATCH v6 14/17] powerpc: Add support for setting SPRN_TIDR Sukadev Bhattiprolu
2017-08-14 7:02 ` Michael Neuling
2017-08-14 7:02 ` Michael Neuling
2017-08-14 13:30 ` Benjamin Herrenschmidt
2017-08-14 19:27 ` Sukadev Bhattiprolu
2017-08-14 11:16 ` Michael Ellerman
2017-08-14 20:03 ` Sukadev Bhattiprolu
2017-08-14 22:25 ` Benjamin Herrenschmidt [this message]
2017-08-14 22:23 ` Benjamin Herrenschmidt
2017-08-08 23:07 ` [PATCH v6 15/17] powerpc/vas: Define window open ioctls API Sukadev Bhattiprolu
2017-08-08 23:07 ` [PATCH v6 16/17] powerpc/vas: Implement a simple FTW driver Sukadev Bhattiprolu
2017-08-14 6:53 ` Michael Ellerman
2017-08-08 23:07 ` [PATCH v6 17/17] powerpc/vas: Document FTW API/usage Sukadev Bhattiprolu
2017-08-14 10:43 ` Michael Neuling
2017-08-14 10:43 ` Michael Neuling
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