Message 343989 - Python tracker

Message343989

Author	jnwatson
Recipients	BTaskaya, adiroiban, brian.curtin, jnwatson, luks, neologix, pitrou
Date	2019-05-30.17:57:27
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1559239047.74.0.800247535134.issue1572968@roundup.psfhosted.org>
In-reply-to

Content
I'll add one more system I/O call that's not GIL-wrapped in the mmap module that can take some time: mmap itself. mmap on Linux with MAP_POPULATE (0x8000) as the flags can take quite a bit of time. That's the flag that prefaults the memory range. MAP_POPULATE has been around since Linux 2.5.46. I know that MAP_POPULATE isn't explicitly supported in the module, but mmap.mmap does take arbitrary flags, so it isn't exactly unsupported either.

Content

I'll add one more system I/O call that's not GIL-wrapped in the mmap module that can take some time:  mmap itself.

mmap on Linux with MAP_POPULATE (0x8000) as the flags can take quite a bit of time.  That's the flag that prefaults the memory range.  MAP_POPULATE has been around since Linux 2.5.46.

I know that MAP_POPULATE isn't explicitly supported in the module, but mmap.mmap does take arbitrary flags, so it isn't exactly unsupported either.

History
Date	User	Action	Args
2019-05-30 17:57:27	jnwatson	set	recipients: + jnwatson, pitrou, luks, brian.curtin, neologix, adiroiban, BTaskaya
2019-05-30 17:57:27	jnwatson	set	messageid: <1559239047.74.0.800247535134.issue1572968@roundup.psfhosted.org>
2019-05-30 17:57:27	jnwatson	link	issue1572968 messages
2019-05-30 17:57:27	jnwatson	create