Re: [PATCH RFC 1/4] mm/page_alloc: convert "report" flag of __free_one_page() to a proper flag
On Wed, Sep 16, 2020 at 08:34:08PM +0200, David Hildenbrand wrote: > Let's prepare for additional flags and avoid long parameter lists of bools. > Follow-up patches will also make use of the flags in __free_pages_ok(), > however, I wasn't able to come up with a better name for the type - should > be good enough for internal purposes. > > Cc: Andrew Morton > Cc: Alexander Duyck > Cc: Mel Gorman > Cc: Michal Hocko > Cc: Dave Hansen > Cc: Vlastimil Babka > Cc: Wei Yang > Cc: Oscar Salvador > Cc: Mike Rapoport > Signed-off-by: David Hildenbrand Reviewed-by: Oscar Salvador -- Oscar Salvador SUSE L3
Re: [PATCH RFC 1/4] mm/page_alloc: convert "report" flag of __free_one_page() to a proper flag
On 9/16/20 8:34 PM, David Hildenbrand wrote:
> Let's prepare for additional flags and avoid long parameter lists of bools.
> Follow-up patches will also make use of the flags in __free_pages_ok(),
> however, I wasn't able to come up with a better name for the type - should
> be good enough for internal purposes.
>
> Cc: Andrew Morton
> Cc: Alexander Duyck
> Cc: Mel Gorman
> Cc: Michal Hocko
> Cc: Dave Hansen
> Cc: Vlastimil Babka
> Cc: Wei Yang
> Cc: Oscar Salvador
> Cc: Mike Rapoport
> Signed-off-by: David Hildenbrand
Reviewed-by: Vlastimil Babka
> ---
> mm/page_alloc.c | 28
> 1 file changed, 20 insertions(+), 8 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 6b699d273d6e..91cefb8157dd 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -77,6 +77,18 @@
> #include "shuffle.h"
> #include "page_reporting.h"
>
> +/* Free One Page flags: for internal, non-pcp variants of free_pages(). */
> +typedef int __bitwise fop_t;
> +
> +/* No special request */
> +#define FOP_NONE ((__force fop_t)0)
> +
> +/*
> + * Skip free page reporting notification after buddy merging (will *not* mark
> + * the page reported, only skip the notification).
> + */
> +#define FOP_SKIP_REPORT_NOTIFY ((__force fop_t)BIT(0))
> +
> /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */
> static DEFINE_MUTEX(pcp_batch_high_lock);
> #define MIN_PERCPU_PAGELIST_FRACTION (8)
> @@ -948,10 +960,9 @@ buddy_merge_likely(unsigned long pfn, unsigned long
> buddy_pfn,
> * -- nyc
> */
>
> -static inline void __free_one_page(struct page *page,
> - unsigned long pfn,
> - struct zone *zone, unsigned int order,
> - int migratetype, bool report)
> +static inline void __free_one_page(struct page *page, unsigned long pfn,
> +struct zone *zone, unsigned int order,
> +int migratetype, fop_t fop_flags)
> {
> struct capture_control *capc = task_capc(zone);
> unsigned long buddy_pfn;
> @@ -1038,7 +1049,7 @@ static inline void __free_one_page(struct page *page,
> add_to_free_list(page, zone, order, migratetype);
>
> /* Notify page reporting subsystem of freed page */
> - if (report)
> + if (!(fop_flags & FOP_SKIP_REPORT_NOTIFY))
> page_reporting_notify_free(order);
> }
>
> @@ -1368,7 +1379,7 @@ static void free_pcppages_bulk(struct zone *zone, int
> count,
> if (unlikely(isolated_pageblocks))
> mt = get_pageblock_migratetype(page);
>
> - __free_one_page(page, page_to_pfn(page), zone, 0, mt, true);
> + __free_one_page(page, page_to_pfn(page), zone, 0, mt, FOP_NONE);
> trace_mm_page_pcpu_drain(page, 0, mt);
> }
> spin_unlock(>lock);
> @@ -1384,7 +1395,7 @@ static void free_one_page(struct zone *zone,
> is_migrate_isolate(migratetype))) {
> migratetype = get_pfnblock_migratetype(page, pfn);
> }
> - __free_one_page(page, pfn, zone, order, migratetype, true);
> + __free_one_page(page, pfn, zone, order, migratetype, FOP_NONE);
> spin_unlock(>lock);
> }
>
> @@ -3277,7 +3288,8 @@ void __putback_isolated_page(struct page *page,
> unsigned int order, int mt)
> lockdep_assert_held(>lock);
>
> /* Return isolated page to tail of freelist. */
> - __free_one_page(page, page_to_pfn(page), zone, order, mt, false);
> + __free_one_page(page, page_to_pfn(page), zone, order, mt,
> + FOP_SKIP_REPORT_NOTIFY);
> }
>
> /*
>
Re: [PATCH RFC 1/4] mm/page_alloc: convert "report" flag of __free_one_page() to a proper flag
On 18.09.20 03:53, Wei Yang wrote: > On Wed, Sep 16, 2020 at 08:34:08PM +0200, David Hildenbrand wrote: >> Let's prepare for additional flags and avoid long parameter lists of bools. >> Follow-up patches will also make use of the flags in __free_pages_ok(), >> however, I wasn't able to come up with a better name for the type - should >> be good enough for internal purposes. >> >> Cc: Andrew Morton >> Cc: Alexander Duyck >> Cc: Mel Gorman >> Cc: Michal Hocko >> Cc: Dave Hansen >> Cc: Vlastimil Babka >> Cc: Wei Yang >> Cc: Oscar Salvador >> Cc: Mike Rapoport >> Signed-off-by: David Hildenbrand >> --- >> mm/page_alloc.c | 28 >> 1 file changed, 20 insertions(+), 8 deletions(-) >> >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index 6b699d273d6e..91cefb8157dd 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -77,6 +77,18 @@ >> #include "shuffle.h" >> #include "page_reporting.h" >> >> +/* Free One Page flags: for internal, non-pcp variants of free_pages(). */ >> +typedef int __bitwise fop_t; >> + >> +/* No special request */ >> +#define FOP_NONE((__force fop_t)0) >> + >> +/* >> + * Skip free page reporting notification after buddy merging (will *not* >> mark > > __free_one_page() may not merge buddy when its buddy is not available. > > Would this comment be a little confusing? > I rather meant the process than if it's actually happening. "Skip free page reporting notification for the (possibly merged) page." Thanks! -- Thanks, David / dhildenb
Re: [PATCH RFC 1/4] mm/page_alloc: convert "report" flag of __free_one_page() to a proper flag
On Wed, Sep 16, 2020 at 08:34:08PM +0200, David Hildenbrand wrote:
>Let's prepare for additional flags and avoid long parameter lists of bools.
>Follow-up patches will also make use of the flags in __free_pages_ok(),
>however, I wasn't able to come up with a better name for the type - should
>be good enough for internal purposes.
>
>Cc: Andrew Morton
>Cc: Alexander Duyck
>Cc: Mel Gorman
>Cc: Michal Hocko
>Cc: Dave Hansen
>Cc: Vlastimil Babka
>Cc: Wei Yang
>Cc: Oscar Salvador
>Cc: Mike Rapoport
>Signed-off-by: David Hildenbrand
>---
> mm/page_alloc.c | 28
> 1 file changed, 20 insertions(+), 8 deletions(-)
>
>diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>index 6b699d273d6e..91cefb8157dd 100644
>--- a/mm/page_alloc.c
>+++ b/mm/page_alloc.c
>@@ -77,6 +77,18 @@
> #include "shuffle.h"
> #include "page_reporting.h"
>
>+/* Free One Page flags: for internal, non-pcp variants of free_pages(). */
>+typedef int __bitwise fop_t;
>+
>+/* No special request */
>+#define FOP_NONE ((__force fop_t)0)
>+
>+/*
>+ * Skip free page reporting notification after buddy merging (will *not* mark
__free_one_page() may not merge buddy when its buddy is not available.
Would this comment be a little confusing?
>+ * the page reported, only skip the notification).
>+ */
>+#define FOP_SKIP_REPORT_NOTIFY((__force fop_t)BIT(0))
>+
> /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */
> static DEFINE_MUTEX(pcp_batch_high_lock);
> #define MIN_PERCPU_PAGELIST_FRACTION (8)
>@@ -948,10 +960,9 @@ buddy_merge_likely(unsigned long pfn, unsigned long
>buddy_pfn,
> * -- nyc
> */
>
>-static inline void __free_one_page(struct page *page,
>- unsigned long pfn,
>- struct zone *zone, unsigned int order,
>- int migratetype, bool report)
>+static inline void __free_one_page(struct page *page, unsigned long pfn,
>+ struct zone *zone, unsigned int order,
>+ int migratetype, fop_t fop_flags)
> {
> struct capture_control *capc = task_capc(zone);
> unsigned long buddy_pfn;
>@@ -1038,7 +1049,7 @@ static inline void __free_one_page(struct page *page,
> add_to_free_list(page, zone, order, migratetype);
>
> /* Notify page reporting subsystem of freed page */
>- if (report)
>+ if (!(fop_flags & FOP_SKIP_REPORT_NOTIFY))
> page_reporting_notify_free(order);
> }
>
>@@ -1368,7 +1379,7 @@ static void free_pcppages_bulk(struct zone *zone, int
>count,
> if (unlikely(isolated_pageblocks))
> mt = get_pageblock_migratetype(page);
>
>- __free_one_page(page, page_to_pfn(page), zone, 0, mt, true);
>+ __free_one_page(page, page_to_pfn(page), zone, 0, mt, FOP_NONE);
> trace_mm_page_pcpu_drain(page, 0, mt);
> }
> spin_unlock(>lock);
>@@ -1384,7 +1395,7 @@ static void free_one_page(struct zone *zone,
> is_migrate_isolate(migratetype))) {
> migratetype = get_pfnblock_migratetype(page, pfn);
> }
>- __free_one_page(page, pfn, zone, order, migratetype, true);
>+ __free_one_page(page, pfn, zone, order, migratetype, FOP_NONE);
> spin_unlock(>lock);
> }
>
>@@ -3277,7 +3288,8 @@ void __putback_isolated_page(struct page *page, unsigned
>int order, int mt)
> lockdep_assert_held(>lock);
>
> /* Return isolated page to tail of freelist. */
>- __free_one_page(page, page_to_pfn(page), zone, order, mt, false);
>+ __free_one_page(page, page_to_pfn(page), zone, order, mt,
>+ FOP_SKIP_REPORT_NOTIFY);
> }
>
> /*
>--
>2.26.2
--
Wei Yang
Help you, Help me
Re: [PATCH RFC 1/4] mm/page_alloc: convert "report" flag of __free_one_page() to a proper flag
On Wed, Sep 16, 2020 at 11:34 AM David Hildenbrand wrote:
>
> Let's prepare for additional flags and avoid long parameter lists of bools.
> Follow-up patches will also make use of the flags in __free_pages_ok(),
> however, I wasn't able to come up with a better name for the type - should
> be good enough for internal purposes.
>
> Cc: Andrew Morton
> Cc: Alexander Duyck
> Cc: Mel Gorman
> Cc: Michal Hocko
> Cc: Dave Hansen
> Cc: Vlastimil Babka
> Cc: Wei Yang
> Cc: Oscar Salvador
> Cc: Mike Rapoport
> Signed-off-by: David Hildenbrand
> ---
> mm/page_alloc.c | 28
> 1 file changed, 20 insertions(+), 8 deletions(-)
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 6b699d273d6e..91cefb8157dd 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -77,6 +77,18 @@
> #include "shuffle.h"
> #include "page_reporting.h"
>
> +/* Free One Page flags: for internal, non-pcp variants of free_pages(). */
> +typedef int __bitwise fop_t;
> +
> +/* No special request */
> +#define FOP_NONE ((__force fop_t)0)
> +
> +/*
> + * Skip free page reporting notification after buddy merging (will *not* mark
> + * the page reported, only skip the notification).
> + */
> +#define FOP_SKIP_REPORT_NOTIFY ((__force fop_t)BIT(0))
> +
> /* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */
> static DEFINE_MUTEX(pcp_batch_high_lock);
> #define MIN_PERCPU_PAGELIST_FRACTION (8)
> @@ -948,10 +960,9 @@ buddy_merge_likely(unsigned long pfn, unsigned long
> buddy_pfn,
> * -- nyc
> */
>
> -static inline void __free_one_page(struct page *page,
> - unsigned long pfn,
> - struct zone *zone, unsigned int order,
> - int migratetype, bool report)
> +static inline void __free_one_page(struct page *page, unsigned long pfn,
> + struct zone *zone, unsigned int order,
> + int migratetype, fop_t fop_flags)
> {
> struct capture_control *capc = task_capc(zone);
> unsigned long buddy_pfn;
> @@ -1038,7 +1049,7 @@ static inline void __free_one_page(struct page *page,
> add_to_free_list(page, zone, order, migratetype);
>
> /* Notify page reporting subsystem of freed page */
> - if (report)
> + if (!(fop_flags & FOP_SKIP_REPORT_NOTIFY))
> page_reporting_notify_free(order);
> }
>
> @@ -1368,7 +1379,7 @@ static void free_pcppages_bulk(struct zone *zone, int
> count,
> if (unlikely(isolated_pageblocks))
> mt = get_pageblock_migratetype(page);
>
> - __free_one_page(page, page_to_pfn(page), zone, 0, mt, true);
> + __free_one_page(page, page_to_pfn(page), zone, 0, mt,
> FOP_NONE);
> trace_mm_page_pcpu_drain(page, 0, mt);
> }
> spin_unlock(>lock);
> @@ -1384,7 +1395,7 @@ static void free_one_page(struct zone *zone,
> is_migrate_isolate(migratetype))) {
> migratetype = get_pfnblock_migratetype(page, pfn);
> }
> - __free_one_page(page, pfn, zone, order, migratetype, true);
> + __free_one_page(page, pfn, zone, order, migratetype, FOP_NONE);
> spin_unlock(>lock);
> }
>
> @@ -3277,7 +3288,8 @@ void __putback_isolated_page(struct page *page,
> unsigned int order, int mt)
> lockdep_assert_held(>lock);
>
> /* Return isolated page to tail of freelist. */
> - __free_one_page(page, page_to_pfn(page), zone, order, mt, false);
> + __free_one_page(page, page_to_pfn(page), zone, order, mt,
> + FOP_SKIP_REPORT_NOTIFY);
> }
>
> /*
Seems pretty straight forward. So we are basically flipping the logic
and replacing !report with FOP_SKIP_REPORT_NOTIFY.
Reviewed-by: Alexander Duyck
