linux-kernel - Re: [PATCH v2 08/18] x86/sgx: Allow reclaiming up to 32 pages, but scan 16 by default

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Date:   Thu, 8 Dec 2022 09:27:36 +0000
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Kristen Carlson Accardi <kristen@...ux.intel.com>
Cc:     dave.hansen@...ux.intel.com, tj@...nel.org,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org,
        cgroups@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        zhiquan1.li@...el.com, Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH v2 08/18] x86/sgx: Allow reclaiming up to 32 pages, but
 scan 16 by default

On Thu, Dec 08, 2022 at 09:26:35AM +0000, Jarkko Sakkinen wrote:
> On Fri, Dec 02, 2022 at 10:36:44AM -0800, Kristen Carlson Accardi wrote:
> > From: Sean Christopherson <sean.j.christopherson@...el.com>
> > 
> > Modify sgx_reclaim_pages() to take a parameter that specifies the
> > number of pages to scan for reclaiming. Specify a max value of
> > 32, but scan 16 in the usual case. This allows the number of pages
> > sgx_reclaim_pages() scans to be specified by the caller, and adjusted
> > in future patches.
> > 
> > Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> > Signed-off-by: Kristen Carlson Accardi <kristen@...ux.intel.com>
> > Cc: Sean Christopherson <seanjc@...gle.com>
> > ---
> >  arch/x86/kernel/cpu/sgx/main.c | 25 +++++++++++++++----------
> >  1 file changed, 15 insertions(+), 10 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
> > index 83aaf5cea7b9..f201ca85212f 100644
> > --- a/arch/x86/kernel/cpu/sgx/main.c
> > +++ b/arch/x86/kernel/cpu/sgx/main.c
> > @@ -18,6 +18,8 @@
> >  #include "encl.h"
> >  #include "encls.h"
> >  
> > +#define SGX_MAX_NR_TO_RECLAIM	32
> 
> SGX_NR_TO_SCAN_MAX

Would also deserve a descriptive comment.

BR, Jarkko