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Tue, 12 May 2026 13:41:23 -0700 (PDT) Date: Tue, 12 May 2026 20:41:21 +0000 From: Pasha Tatashin To: Pratyush Yadav Cc: Pasha Tatashin , linux-kselftest@vger.kernel.org, rppt@kernel.org, shuah@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, dmatlack@google.com, kexec@lists.infradead.org, skhawaja@google.com, graf@amazon.com Subject: Re: [PATCH 4/5] selftests/liveupdate: Add stress-sessions kexec test Message-ID: References: <20260414200237.444170-1-pasha.tatashin@soleen.com> <20260414200237.444170-5-pasha.tatashin@soleen.com> <2vxzlddoafel.fsf@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2vxzlddoafel.fsf@kernel.org> X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 79BADC0005 X-Stat-Signature: 5u674w5fhwbry1a34ahn86sp5c6cfwcg X-Rspam-User: X-HE-Tag: 1778618484-54505 X-HE-Meta: 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 NBZAwFn8 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 05-12 16:09, Pratyush Yadav wrote: > On Tue, Apr 14 2026, Pasha Tatashin wrote: > > > Add a new test that creates 2000 LUO sessions before a kexec > > reboot and verifies their presence after the reboot. This ensures > > that the linked-block serialization mechanism works correctly for > > a large number of sessions. > > > > Signed-off-by: Pasha Tatashin > > --- > > diff --git a/tools/testing/selftests/liveupdate/luo_test_utils.c b/tools/testing/selftests/liveupdate/luo_test_utils.c > > index 3c8721c505df..37c330b9bb36 100644 > > --- a/tools/testing/selftests/liveupdate/luo_test_utils.c > > +++ b/tools/testing/selftests/liveupdate/luo_test_utils.c > > @@ -20,6 +20,7 @@ > > #include > > #include > > #include > > +#include > > > > #include "luo_test_utils.h" > > > > @@ -28,6 +29,30 @@ int luo_open_device(void) > > return open(LUO_DEVICE, O_RDWR); > > } > > > > +void luo_ensure_nofile_limit(long min_limit) > > Since you are adding this to luo_test_utils anyway, I think you should > do it in patch 3 and use it there too. Done > > LGTM otherwise. > > > +{ > > + struct rlimit hl; > > + > > + if (getrlimit(RLIMIT_NOFILE, &hl) < 0) > > + ksft_exit_fail_msg("getrlimit failed: %s\n", strerror(errno)); > > + > > + if (hl.rlim_cur >= min_limit) > > + return; > > + > > + hl.rlim_cur = min_limit; > > + if (hl.rlim_cur > hl.rlim_max) > > + hl.rlim_max = hl.rlim_cur; > > + > > + if (setrlimit(RLIMIT_NOFILE, &hl) < 0) { > > + if (errno == EPERM) { > > + ksft_exit_skip("Insufficient privileges to set RLIMIT_NOFILE to %ld\n", > > + hl.rlim_cur); > > + } > > + ksft_exit_fail_msg("setrlimit to %ld failed: %s\n", > > + hl.rlim_cur, strerror(errno)); > > + } > > +} > > + > > int luo_create_session(int luo_fd, const char *name) > > { > > struct liveupdate_ioctl_create_session arg = { .size = sizeof(arg) }; > > -- > Regards, > Pratyush Yadav