The patch titled
Subject: mm: vmalloc: use trace_purge_vmap_area_lazy event
has been added to the -mm mm-unstable branch. Its filename is
mm-vmalloc-use-trace_purge_vmap_area_lazy-event.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-use-trace_purge_vmap_area_lazy-event.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: "Uladzislau Rezki (Sony)" <urezki@xxxxxxxxx>
Subject: mm: vmalloc: use trace_purge_vmap_area_lazy event
Date: Tue, 18 Oct 2022 20:10:51 +0200
This is for debug purposes and is called when all outstanding areas are
removed back to the vmap space. It gives some extra information about:
- a start:end range where set of vmap ares were freed;
- a number of purged areas which were backed off.
Link: https://lkml.kernel.org/r/20221018181053.434508-6-urezki@xxxxxxxxx
Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/mm/vmalloc.c~mm-vmalloc-use-trace_purge_vmap_area_lazy-event
+++ a/mm/vmalloc.c
@@ -1730,6 +1730,7 @@ static void purge_fragmented_blocks_allc
static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
{
unsigned long resched_threshold;
+ unsigned int num_purged_areas = 0;
struct list_head local_purge_list;
struct vmap_area *va, *n_va;
@@ -1741,7 +1742,7 @@ static bool __purge_vmap_area_lazy(unsig
spin_unlock(&purge_vmap_area_lock);
if (unlikely(list_empty(&local_purge_list)))
- return false;
+ goto out;
start = min(start,
list_first_entry(&local_purge_list,
@@ -1776,12 +1777,16 @@ static bool __purge_vmap_area_lazy(unsig
va->va_start, va->va_end);
atomic_long_sub(nr, &vmap_lazy_nr);
+ num_purged_areas++;
if (atomic_long_read(&vmap_lazy_nr) < resched_threshold)
cond_resched_lock(&free_vmap_area_lock);
}
spin_unlock(&free_vmap_area_lock);
- return true;
+
+out:
+ trace_purge_vmap_area_lazy(start, end, num_purged_areas);
+ return num_purged_areas > 0 ? true:false;
}
/*
_
Patches currently in -mm which might be from urezki@xxxxxxxxx are
mm-vmalloc-add-alloc_vmap_area-trace-event.patch
mm-vmalloc-add-purge_vmap_area_lazy-trace-event.patch
mm-vmalloc-add-free_vmap_area_noflush-trace-event.patch
mm-vmalloc-use-trace_alloc_vmap_area-event.patch
mm-vmalloc-use-trace_purge_vmap_area_lazy-event.patch
mm-vmalloc-use-trace_free_vmap_area_noflush-event.patch
vmalloc-add-reviewers-for-vmalloc-code.patch
