From: Nixiaoming <email@example.com> To: Jan Kara <firstname.lastname@example.org> Cc: "email@example.com" <firstname.lastname@example.org>, "Amir Goldstein" <email@example.com> Subject: RE: [PATCH v3 7/8] fanotify: support reporting thread id instead of process id Date: Fri, 12 Oct 2018 02:43:02 +0000 [thread overview] Message-ID: <E490CD805F7529488761C40FD9D26EF12A801F5E@DGGEMM527-MBS.china.huawei.com> (raw) In-Reply-To: <20181011101625.GA9467@quack2.suse.cz> On Thu, Oct 11, 2018 at 6:16 PM Jan Kara <mailto:firstname.lastname@example.org> wrote: >On Thu 04-10-18 00:25:38, Amir Goldstein wrote: >> In order to identify which thread triggered the event in a >> multi-threaded program, add the FAN_EVENT_INFO_TID flag in fanotify_init >> to opt-in for reporting the event creator's thread id information. >> >> Signed-off-by: nixiaoming <email@example.com> >> Signed-off-by: Amir Goldstein <firstname.lastname@example.org> > >Just one question occurred to me (after discussion with a colleague about >this feature): Ming, why do you actually need to know thread ID and >thread-group ID is not enough? Also note that standard glibc threading >functions are *not* going to be compatible with the ID returned from >fanotify (e.g. it will be different from POSIX thread ID as returned by >pthread_self()). So the feature is somewhat difficult to use from >userspace... (at least you could use gettid() systemcall to get the ID of >current thread but there's not glibc wrapper for it). > When using fanotify to monitor system critical directories or files, the monitor and event trigger are not the same process. The monitoring task wants to know which task triggers the event. If the event is triggered by multiple threads, I hope to know which thread is triggered by the task, can't see the pthread id here, but I can see the tid. Thanks
next prev parent reply other threads:[~2018-10-12 10:13 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-10-03 21:25 [PATCH v3 0/8] New fanotify event info API Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 1/8] fanotify: fix collision of internal and uapi mark flags Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 2/8] fsnotify: generalize handling of extra event flags Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 3/8] fanotify: simplify handling of FAN_ONDIR Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 4/8] fanotify: deprecate uapi FAN_ALL_* constants Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 5/8] fsnotify: convert runtime BUG_ON() to BUILD_BUG_ON() Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 6/8] fanotify: add BUILD_BUG_ON() to count the bits of fanotify constants Amir Goldstein 2018-10-04 8:41 ` Jan Kara 2018-10-04 10:24 ` Amir Goldstein 2018-10-03 21:25 ` [PATCH v3 7/8] fanotify: support reporting thread id instead of process id Amir Goldstein 2018-10-04 8:46 ` Jan Kara 2018-10-04 10:27 ` Amir Goldstein 2018-10-11 10:16 ` Jan Kara 2018-10-12 2:43 ` Nixiaoming [this message] 2018-10-16 12:06 ` Jan Kara 2018-10-03 21:25 ` [PATCH v3 8/8] fsnotify: optimize away srcu_read_lock() for events on directories Amir Goldstein 2018-10-04 9:09 ` Jan Kara 2018-10-04 10:30 ` Amir Goldstein 2018-10-04 11:26 ` Jan Kara 2018-10-04 22:05 ` Amir Goldstein
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=E490CD805F7529488761C40FD9D26EF12A801F5E@DGGEMM527-MBS.china.huawei.com \ --email@example.com \ --firstname.lastname@example.org \ --email@example.com \ --firstname.lastname@example.org \ --subject='RE: [PATCH v3 7/8] fanotify: support reporting thread id instead of process id' \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: link
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).