From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EF50E221281 for ; Thu, 31 Jul 2025 19:04:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753988664; cv=none; b=Tij1LPGMTZuocxI84O/UnQaA6wNHJvowf65Jjd6GAh9BeE/Y7m1LHOKlSMyZPRZII4Gsvni+MHnyqLds1GR3ylPQ8lTkEXhr6S/6EdrkugLFkOBhci58EJWD/beHZWJPz5gFRrzQeba9+OjJ+dG3fr+CQhcqqRnULgWGW9hbfn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753988664; c=relaxed/simple; bh=jlnt+yWRYm0QmE+1kbnqrl5vtPyzttrPV20K4egp1fM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=TE1A6tmPvxKAFFekMa1boTxZ2XCaqxlg+Zg6+SIjJnnnWEoWc8qRjZiIMTHnpxgenaP9xLJ5P5CyH6lTFs0z9Djh3ZC1C7AeVCN2MET0AFGMZYQv2dgzChMmrLVLDk2169iI8w2zAb/7H2jF4cQ8TS89Jd08V/Hgb/ncb8yIx8U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nAj3OQKk; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nAj3OQKk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4DA9FC4CEEF; Thu, 31 Jul 2025 19:04:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753988663; bh=jlnt+yWRYm0QmE+1kbnqrl5vtPyzttrPV20K4egp1fM=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=nAj3OQKkwRxd17vtUSRm2zEJqELEJa/7czBGZC6+FP255Fh5+QSRJQHS6pd69AFVX IrVc5n951ykLHg07DVzApaiRg6zDGPK8eneibKH80vG6g2D6zPaTYkOFjaWTdU7ViL vSlCk9Aw8CGyI1OrGXemSeLWhtndGo8AZGCTGzu0jssdMVNVkUSGvxPqM9YxsxOhv5 JpSr8yrAhYP/bHiyZetnQBm535zwCbWi7YYjpwhJlEztfOftEt54fEs5G1qs4MNFzx bst28q8H+gmUzyysiRfLMqg33A091suyt5efRodAF/mfSLHvvi2DnNZ+Gu1XMZeGWW pK1kbhlfAKvUA== Message-ID: <475075085c8b8c7a9de7c20d281c4672a2ac2368.camel@kernel.org> Subject: Re: [PATCH 1/3] NFSD: rename and update nfsd_read_vector_dio trace event to nfsd_analyze_dio From: Jeff Layton To: Mike Snitzer Cc: Chuck Lever , linux-nfs@vger.kernel.org Date: Thu, 31 Jul 2025 15:04:22 -0400 In-Reply-To: References: <20250730230524.84976-1-snitzer@kernel.org> <20250730230524.84976-2-snitzer@kernel.org> <19f157f743681fe8bb28279747248b0c3ca7b81c.camel@kernel.org> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv egyjnSsFt7EGoDjdKqr1TS9syJYFjagYtvWk/UfHlW09X+jOh4vYtfX7iYSx/NfqV3W1D7EDi0PqV T2h6v8i8YqsATFPwO4nuiTmL6I40ZofxVd+9wdRI4Db8yUNA4ZSP2nqLcLtFjClYRBoJvRWvsv4lm 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11:31:29AM -0400, Jeff Layton wrote: > > On Wed, 2025-07-30 at 19:05 -0400, Mike Snitzer wrote: > > > From: Mike Snitzer > > >=20 > > > Rename nfsd_read_vector_dio trace event to nfsd_analyze_dio and updat= e > > > it so that it provides useful tracing for both READ and WRITE. This > > > prepares for nfsd_vfs_write() to also make use of it when handling > > > misaligned WRITEs. > > >=20 > > > Signed-off-by: Mike Snitzer > > > --- > > > fs/nfsd/trace.h | 37 ++++++++++++++++++++++++------------- > > > fs/nfsd/vfs.c | 11 ++++++----- > > > 2 files changed, 30 insertions(+), 18 deletions(-) > > >=20 > > > diff --git a/fs/nfsd/trace.h b/fs/nfsd/trace.h > > > index 55055482f8a8..51b47fd041a8 100644 > > > --- a/fs/nfsd/trace.h > > > +++ b/fs/nfsd/trace.h > > > @@ -473,41 +473,52 @@ DEFINE_NFSD_IO_EVENT(write_done); > > > DEFINE_NFSD_IO_EVENT(commit_start); > > > DEFINE_NFSD_IO_EVENT(commit_done); > > > =20 > > > -TRACE_EVENT(nfsd_read_vector_dio, > > > +TRACE_EVENT(nfsd_analyze_dio, > > > TP_PROTO(struct svc_rqst *rqstp, > > > struct svc_fh *fhp, > > > + u32 rw, > >=20 > > I would do this a bit differently. You're hardcoding READ and WRITE > > into both tracepoints. I would turn this trace event into a class a'la > > DECLARE_EVENT_CLASS, and then just define two different tracepoints > > (maybe trace_nfsd_analyze_read/write_dio). Then you can just drop the > > above u32 field, and it'll still be evident whether it's a read or > > write in the log. >=20 > Seems overkill to me, and also forces the need for user to enable > discrete tracepoints. Could be good, could be bad. >=20 > But if I should be taking your feedback as: "do what Jeff suggested", > that's fine too, happy to do so! ;) >=20 I'd prefer it changed. It's pretty simple to convert a TRACE_EVENT to a tracepoint class. It'll also consume less memory. --=20 Jeff Layton