From: Benjamin Marzinski <bmarzins@redhat.com>
To: mwilck@suse.com
Cc: dm-devel@redhat.com
Subject: Re: [PATCH 06/11] libmultipath: checkers/prio: allow non-lazy .so loading
Date: Thu, 24 Sep 2020 15:27:14 -0500 [thread overview]
Message-ID: <20200924202714.GI11108@octiron.msp.redhat.com> (raw)
In-Reply-To: <20200924133644.14034-7-mwilck@suse.com>
On Thu, Sep 24, 2020 at 03:36:39PM +0200, mwilck@suse.com wrote:
> From: Martin Wilck <mwilck@suse.com>
>
> If compiled with -DLOAD_ALL_SHARED_LIBS, all known prioritizers
> and checkers will be loaded immediately on startup. This is useful
> for determining symbol usage (start executables with LD_BIND_NOW=1).
It seems like you could avoid having to remember to update these arrays
when new checker or prio DSOs are added by just scanning multipath_dir
for all the existing checkers/prioritizers. On the flip side, I'm not
sure that's worth the extra work, and this way has the benefit of
warning if any expected chekers/priotitizers are missing, so
Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
> ---
> libmultipath/checkers.c | 17 +++++++++++++++++
> libmultipath/prio.c | 22 ++++++++++++++++++++++
> 2 files changed, 39 insertions(+)
>
> diff --git a/libmultipath/checkers.c b/libmultipath/checkers.c
> index f7ddd53..18b1f5e 100644
> --- a/libmultipath/checkers.c
> +++ b/libmultipath/checkers.c
> @@ -7,6 +7,7 @@
> #include "debug.h"
> #include "checkers.h"
> #include "vector.h"
> +#include "util.h"
>
> struct checker_class {
> struct list_head node;
> @@ -375,7 +376,23 @@ void checker_get(const char *multipath_dir, struct checker *dst,
>
> int init_checkers(const char *multipath_dir)
> {
> +#ifdef LOAD_ALL_SHARED_LIBS
> + static const char *const all_checkers[] = {
> + DIRECTIO,
> + TUR,
> + HP_SW,
> + RDAC,
> + EMC_CLARIION,
> + READSECTOR0,
> + CCISS_TUR,
> + };
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(all_checkers); i++)
> + add_checker_class(multipath_dir, all_checkers[i]);
> +#else
> if (!add_checker_class(multipath_dir, DEFAULT_CHECKER))
> return 1;
> +#endif
> return 0;
> }
> diff --git a/libmultipath/prio.c b/libmultipath/prio.c
> index 3a718ba..c92bde7 100644
> --- a/libmultipath/prio.c
> +++ b/libmultipath/prio.c
> @@ -20,8 +20,30 @@ unsigned int get_prio_timeout(unsigned int timeout_ms,
>
> int init_prio (const char *multipath_dir)
> {
> +#ifdef LOAD_ALL_SHARED_LIBS
> + static const char *const all_prios[] = {
> + PRIO_ALUA,
> + PRIO_CONST,
> + PRIO_DATACORE,
> + PRIO_EMC,
> + PRIO_HDS,
> + PRIO_HP_SW,
> + PRIO_ONTAP,
> + PRIO_RANDOM,
> + PRIO_RDAC,
> + PRIO_WEIGHTED_PATH,
> + PRIO_SYSFS,
> + PRIO_PATH_LATENCY,
> + PRIO_ANA,
> + };
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(all_prios); i++)
> + add_prio(multipath_dir, all_prios[i]);
> +#else
> if (!add_prio(multipath_dir, DEFAULT_PRIO))
> return 1;
> +#endif
> return 0;
> }
>
> --
> 2.28.0
next prev parent reply other threads:[~2020-09-24 20:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 13:36 [PATCH 00/11] multipath-tools: add linker version scripts mwilck
2020-09-24 13:36 ` [PATCH 01/11] libmultipath: find_mpe(): don't match with empty WWID mwilck
2020-09-24 13:36 ` [PATCH 02/11] libmultipath: copy mpp->hwe from pp->hwe mwilck
2020-09-24 20:12 ` Benjamin Marzinski
2020-09-25 16:01 ` Martin Wilck
2020-09-25 16:06 ` Benjamin Marzinski
2020-09-24 13:36 ` [PATCH 03/11] libmultipath: dm_map_present_by_uuid(): fix dm_task_create() call mwilck
2020-09-24 13:36 ` [PATCH 04/11] libdmmp tests: fix compilation mwilck
2020-09-24 13:36 ` [PATCH 05/11] libmultipath: prio: constify some function parameters mwilck
2020-09-24 13:36 ` [PATCH 06/11] libmultipath: checkers/prio: allow non-lazy .so loading mwilck
2020-09-24 20:27 ` Benjamin Marzinski [this message]
2020-09-24 13:36 ` [PATCH 07/11] multipath-tools Makefiles: separate rules for .so and man pages mwilck
2020-09-24 13:36 ` [PATCH 08/11] libmultipath: create separate .so for unit tests mwilck
2020-09-24 23:35 ` Benjamin Marzinski
2020-09-24 13:36 ` [PATCH 09/11] libmultipath: add linker version script mwilck
2020-09-24 13:36 ` [PATCH 10/11] libmpathpersist: " mwilck
2020-09-25 4:00 ` Benjamin Marzinski
2020-09-25 19:52 ` Martin Wilck
2020-09-25 22:10 ` Benjamin Marzinski
[not found] ` <20200925223207.GC3384@octiron.msp.redhat.com>
[not found] ` <c0a1e44fcc819583d972884aa126c486fc784fa9.camel@suse.com>
2020-09-25 23:22 ` Benjamin Marzinski
2020-09-24 13:36 ` [PATCH 11/11] libmpathcmd: " mwilck
2020-09-25 2:09 ` [PATCH 00/11] multipath-tools: add linker version scripts Benjamin Marzinski
2020-09-25 19:53 ` Martin Wilck
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