From: Brendan Higgins <brendanhiggins@google.com>
To: Stephen Boyd <sboyd@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>,
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Subject: Re: [PATCH v9 03/18] kunit: test: add string_stream a std::stream like string builder
Date: Tue, 16 Jul 2019 11:55:54 -0700 [thread overview]
Message-ID: <CAFd5g47Nawp7V8=hetgBQWzWqmEyAz1GtWWwMrb9k=CCR33inQ@mail.gmail.com> (raw)
In-Reply-To: <20190716153400.5CB182054F@mail.kernel.org>
On Tue, Jul 16, 2019 at 8:34 AM Stephen Boyd <sboyd@kernel.org> wrote:
>
> Quoting Brendan Higgins (2019-07-15 15:43:20)
> > On Mon, Jul 15, 2019 at 3:11 PM Brendan Higgins
> > <brendanhiggins@google.com> wrote:
> > >
> > > On Mon, Jul 15, 2019 at 3:04 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > >
> > > > Quoting Brendan Higgins (2019-07-15 14:11:50)
> > > > > On Mon, Jul 15, 2019 at 1:43 PM Stephen Boyd <sboyd@kernel.org> wrote:
> > > > > >
> > > > > > I also wonder if it would be better to just have a big slop buffer of a
> > > > > > 4K page or something so that we almost never have to allocate anything
> > > > > > with a string_stream and we can just rely on a reader consuming data
> > > > > > while writers are writing. That might work out better, but I don't quite
> > > > > > understand the use case for the string stream.
> > > > >
> > > > > That makes sense, but might that also waste memory since we will
> > > > > almost never need that much memory?
> > > >
> > > > Why do we care? These are unit tests.
> > >
> > > Agreed.
> > >
> > > > Having allocations in here makes
> > > > things more complicated, whereas it would be simpler to have a pointer
> > > > and a spinlock operating on a chunk of memory that gets flushed out
> > > > periodically.
> > >
> > > I am not so sure. I have to have the logic to allocate memory in some
> > > case no matter what (what if I need more memory that my preallocated
> > > chuck?). I think it is simpler to always request an allocation than to
> > > only sometimes request an allocation.
> >
> > Another even simpler alternative might be to just allocate memory
> > using kunit_kmalloc as we need it and just let the kunit_resource code
> > handle cleaning it all up when the test case finishes.
>
> Sure, sounds like a nice way to avoid duplicating similar logic to
> maintain a list of things to free later.
I think I will go that route for now.
> >
> > What do you think?
>
> If you go the allocation route then you'll need to have the flags to
> know what context you're in to allocate appropriately. Does that mean
> all the string operations will now take GFP flags?
We could set the GFP flags in the constructor, store them in a field,
and then just reuse them.
Thanks!
next prev parent reply other threads:[~2019-07-16 18:56 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 8:17 [PATCH v9 00/18] kunit: introduce KUnit, the Linux kernel unit testing framework Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 01/18] kunit: test: add KUnit test runner core Brendan Higgins
2019-07-15 20:10 ` Stephen Boyd
2019-07-15 21:25 ` Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 02/18] kunit: test: add test resource management API Brendan Higgins
2019-07-15 20:24 ` Stephen Boyd
2019-07-15 20:30 ` Brendan Higgins
2019-07-15 20:51 ` Stephen Boyd
2019-07-12 8:17 ` [PATCH v9 03/18] kunit: test: add string_stream a std::stream like string builder Brendan Higgins
2019-07-15 20:43 ` Stephen Boyd
2019-07-15 21:11 ` Brendan Higgins
2019-07-15 22:04 ` Stephen Boyd
2019-07-15 22:11 ` Brendan Higgins
2019-07-15 22:43 ` Brendan Higgins
2019-07-16 15:33 ` Stephen Boyd
2019-07-16 18:55 ` Brendan Higgins [this message]
2019-07-12 8:17 ` [PATCH v9 04/18] kunit: test: add kunit_stream a std::stream like logger Brendan Higgins
2019-07-15 22:15 ` Stephen Boyd
2019-07-16 7:57 ` Brendan Higgins
2019-07-16 8:37 ` Brendan Higgins
2019-07-16 15:30 ` Stephen Boyd
2019-07-16 17:51 ` Brendan Higgins
2019-07-16 17:50 ` Stephen Boyd
2019-07-16 18:52 ` Brendan Higgins
2019-07-18 17:50 ` Stephen Boyd
2019-07-18 19:22 ` Brendan Higgins
2019-07-19 0:08 ` Brendan Higgins
2019-07-22 18:10 ` Brendan Higgins
2019-07-22 20:03 ` Stephen Boyd
2019-07-22 22:30 ` Brendan Higgins
2019-07-22 23:54 ` Stephen Boyd
2019-07-23 0:32 ` Brendan Higgins
2019-07-24 7:31 ` Petr Mladek
2019-07-25 20:21 ` Brendan Higgins
2019-07-26 8:31 ` Petr Mladek
2019-08-01 18:55 ` Brendan Higgins
2019-08-01 18:59 ` Brendan Higgins
2019-08-01 21:14 ` Stephen Boyd
2019-08-01 21:43 ` Brendan Higgins
2019-08-12 20:41 ` Brendan Higgins
2019-08-02 7:37 ` John Ogness
2019-08-12 21:12 ` Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 05/18] kunit: test: add the concept of expectations Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 06/18] kbuild: enable building KUnit Brendan Higgins
2019-07-15 20:49 ` Stephen Boyd
2019-07-12 8:17 ` [PATCH v9 07/18] kunit: test: add initial tests Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 08/18] objtool: add kunit_try_catch_throw to the noreturn list Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 09/18] kunit: test: add support for test abort Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 10/18] kunit: test: add tests for kunit " Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 11/18] kunit: test: add the concept of assertions Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 12/18] kunit: test: add tests for KUnit managed resources Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 13/18] kunit: tool: add Python wrappers for running KUnit tests Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 14/18] kunit: defconfig: add defconfigs for building " Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 15/18] Documentation: kunit: add documentation for KUnit Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 16/18] MAINTAINERS: add entry for KUnit the unit testing framework Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 17/18] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec() Brendan Higgins
2019-07-12 8:17 ` [PATCH v9 18/18] MAINTAINERS: add proc sysctl KUnit test to PROC SYSCTL section Brendan Higgins
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